Articles on OBD-II diagnostics, DTC codes, dashboard warning lights and car repair advice.https://obdllm.com/en-UShttps://obdllm.com/en/blog/repair-prices-ukraine-2026-benchmark/https://obdllm.com/en/blog/repair-prices-ukraine-2026-benchmark/Actual Ukraine repair prices (UAH) for engine, transmission, catalyst, alternator, DPF, injectors, spark plugs, sensors — compared to US benchmarks. Data from Prom.ua, Rozetka, Kyiv service stations as of July 2026.Fri, 17 Jul 2026 00:00:00 GMTrepair costsservice pricesUkraine 2026automotive partslabor ratesbenchmarkhttps://obdllm.com/en/blog/ac-variable-displacement-compressor-diagnostics/https://obdllm.com/en/blog/ac-variable-displacement-compressor-diagnostics/Fixed vs variable displacement AC compressor, how to diagnose the control valve, code B1247, symptoms, and why "clutch not engaging" isn't always an electric fault.Thu, 16 Jul 2026 00:00:00 GMTair conditioningAC compressorrefrigerantB1247climate diagnosticsOBD-IIhttps://obdllm.com/en/blog/egr-diagnostics-cooler-leak-p0401-p0402/https://obdllm.com/en/blog/egr-diagnostics-cooler-leak-p0401-p0402/How to diagnose EGR via OBD-II: difference between P0401 (low flow) and P0402 (high), EGR cooler leak, why "EGR delete" is a short fix with long problems.Thu, 16 Jul 2026 00:00:00 GMTEGRP0401P0402P0404P0405cooler leakdieseldiagnosticshttps://obdllm.com/en/blog/ford-ecoboost-common-obd-issues/https://obdllm.com/en/blog/ford-ecoboost-common-obd-issues/Ford EcoBoost turbocharged specifics: P0299 turbo, P0301 misfire, P0016 timing chain, P0087 fuel pressure — real problem statistics for this engine family.Thu, 16 Jul 2026 00:00:00 GMTFord EcoBoost1.52.0turboP0299P0420OBD-IIhttps://obdllm.com/en/blog/hybrid-battery-state-of-health-monitoring/https://obdllm.com/en/blog/hybrid-battery-state-of-health-monitoring/What State of Health (SoH) HV battery is, how OBD-II reads capacity, block voltage, imbalance for Prius, Insight, Camry Hybrid. When to repair/replace, prices.Thu, 16 Jul 2026 00:00:00 GMThybridHV batterySoHToyota PriusHonda Insightblock imbalancehttps://obdllm.com/en/blog/immobilizer-key-learning-per-brand/https://obdllm.com/en/blog/immobilizer-key-learning-per-brand/Lost your key, bought a new one — how to "program" it in the immobilizer. DIY vs shop, needs ELM327 or a special tool, prices $50-500.Thu, 16 Jul 2026 00:00:00 GMTimmobilizerkey learningToyotaVWBMWFordcodinghttps://obdllm.com/en/blog/p0455-evap-large-leak-deep-dive/https://obdllm.com/en/blog/p0455-evap-large-leak-deep-dive/Deep dive into P0455: how OBD-II detects a large leak, difference from P0442/P0456, EVAP smoke test, why gas cap first, what to do with the charcoal canister.Thu, 16 Jul 2026 00:00:00 GMTP0455EVAPleakfuel cappurge valvediagnosticshttps://obdllm.com/en/blog/8-ai-agents-behind-car-diagnostics/https://obdllm.com/en/blog/8-ai-agents-behind-car-diagnostics/What each of the 8 Car Diagnostics AI agents does: DTC Analyzer, Prediction, Recommendation, Report Generator, Chat, OBD Reader, RAG and Diagnostic MCP. How they work together — and why that's more accurate than a single big ChatGPT.Wed, 15 Jul 2026 00:00:00 GMTAI diagnosticsOBD-IIagentsDTC recognitionmobile diagnosticshttps://obdllm.com/en/blog/abs-wheel-speed-sensor-diagnostics/https://obdllm.com/en/blog/abs-wheel-speed-sensor-diagnostics/What OBD-II shows about wheel speed sensors, difference between active and passive types, how to diagnose ABS/ESP problems via C-codes, and why a "worn tone ring" is common.Wed, 15 Jul 2026 00:00:00 GMTABSwheel speed sensorC0035C0040C0045wheel speedOBD-IIhttps://obdllm.com/en/blog/adas-calibration-obd-lane-assist-acc/https://obdllm.com/en/blog/adas-calibration-obd-lane-assist-acc/Lane Keep Assist, Adaptive Cruise Control, AEB via OBD-II: typical codes U0428, C1B01, why calibration is needed after windshield replacement, and why an OBD adapter won't do it.Wed, 15 Jul 2026 00:00:00 GMTADASlane keepadaptive cruiseACCcalibrationOBD-IIsensorshttps://obdllm.com/en/blog/abs-bleeding-through-obd-scan-tool/https://obdllm.com/en/blog/abs-bleeding-through-obd-scan-tool/How to bleed brakes with ABS: activate the ABS pump via OBD scanner, why air stays in the module manually, which cars support self-bleed.Wed, 15 Jul 2026 00:00:00 GMTABSbrake bleedingscan toolHCUOBD-IIC0035brake systemhttps://obdllm.com/en/blog/adblue-def-system-diagnostics-and-common-faults/https://obdllm.com/en/blog/adblue-def-system-diagnostics-and-common-faults/What AdBlue/DEF is, how OBD-II sees the SCR system, codes P204F, P20E8, P229F, why a Euro 6 diesel stops starting after 5 tries with an empty tank, and how to diagnose NOx sensors.Wed, 15 Jul 2026 00:00:00 GMTAdBlueDEFSCRdieselP204FP20E8AdBlue injectorhttps://obdllm.com/en/blog/air-conditioning-obd-diagnostics-not-cooling/https://obdllm.com/en/blog/air-conditioning-obd-diagnostics-not-cooling/What OBD-II shows about the AC system: codes B1234, B10DA, high/low-side pressure, evaporator temperature, why "just add refrigerant" isn't always the answer, and how to diagnose the compressor clutch.Wed, 15 Jul 2026 00:00:00 GMTair conditioningrefrigerantcompressorpressure sensorB1247B2857OBD-IIhttps://obdllm.com/en/blog/auto-start-stop-diagnostics-not-working/https://obdllm.com/en/blog/auto-start-stop-diagnostics-not-working/Why Auto Start-Stop suddenly stopped working, how OBD-II shows the status (Ready/Not Ready), ECU criteria for the stop, the role of the EFB/AGM battery, and how to diagnose via live parameters.Wed, 15 Jul 2026 00:00:00 GMTstart-stopP164DP16DCbatteryOBD-IIfuel savinghttps://obdllm.com/en/blog/automatic-transmission-atf-diagnostics/https://obdllm.com/en/blog/automatic-transmission-atf-diagnostics/What OBD shows about AT: codes P0700, P0741, P0742, adaptation values, ATF temperature, why "sealed for life" is a marketing myth, and how to diagnose slip.Wed, 15 Jul 2026 00:00:00 GMTautomatic transmissionATFP0729P0730P0731gearbox oildiagnosticshttps://obdllm.com/en/blog/battery-alternator-obd-diagnostics-p0562-p0620/https://obdllm.com/en/blog/battery-alternator-obd-diagnostics-p0562-p0620/What OBD-II says about the battery and alternator: codes P0562 (low voltage), P0563 (high), P0620 (alternator). How to read system voltage and why "overcharge" is more dangerous than "undercharge".Wed, 15 Jul 2026 00:00:00 GMTbatteryalternatorP0562P0620voltagediagnosticsOBD-IIhttps://obdllm.com/en/blog/bcm-body-control-module-diagnostics/https://obdllm.com/en/blog/bcm-body-control-module-diagnostics/What BCM does, how OBD-II reads B-codes and U-codes, why "the window is stuck from pause" is often the BCM, and how to tell the module from a wiring fault.Wed, 15 Jul 2026 00:00:00 GMTBCMbody control moduleB10E1U1000power windowcentral lockOBD-IIhttps://obdllm.com/en/blog/best-obd-pids-to-log-daily-driver/https://obdllm.com/en/blog/best-obd-pids-to-log-daily-driver/The most useful OBD-II PIDs for daily monitoring: LTFT, coolant temp, MAF, boost pressure, misfire counter. How to set up automatic logging in Car Diagnostics and what to do with the trends.Wed, 15 Jul 2026 00:00:00 GMTOBD PIDloggingMode 01engine monitoringearly detectiondiagnosticshttps://obdllm.com/en/blog/brake-pad-wear-obd-monitoring/https://obdllm.com/en/blog/brake-pad-wear-obd-monitoring/What OBD-II shows about brake pads on modern cars: wear sensors, calculated brake pad wear, codes C1000, C1100, and why "2000 mi to replacement" on a BMW is not guesswork.Wed, 15 Jul 2026 00:00:00 GMTbrake pad wearbrake padsservice lifeBMWAudiMercedesOBD-IIhttps://obdllm.com/en/blog/can-bus-fundamentals-for-car-owners/https://obdllm.com/en/blog/can-bus-fundamentals-for-car-owners/Plain-English CAN Bus: how 60+ ECUs communicate over 2 wires, what ISO 15765-4 and ISO-TP are, high-speed vs low-speed CAN, and why "lost communication with ECU" (U0100+) is critical.Wed, 15 Jul 2026 00:00:00 GMTCAN BusCAN protocolU0100ECUdiagnosticshttps://obdllm.com/en/blog/can-fd-flexible-data-rate-explained/https://obdllm.com/en/blog/can-fd-flexible-data-rate-explained/What CAN-FD (Bosch, 2012) is, how it differs from classic CAN, why Tesla, Ford Bronco, BMW 2020+ need new OBD adapters, and how to check if your ELM327 supports CAN-FD.Wed, 15 Jul 2026 00:00:00 GMTCAN-FD8 Mbit/sELM327new standardprotocolOBD-IIhttps://obdllm.com/en/blog/car-wont-start-immobilizer-troubleshooting/https://obdllm.com/en/blog/car-wont-start-immobilizer-troubleshooting/Step-by-step algorithm for "no-start": how OBD-II tells in 5 minutes whether the issue is the immobilizer (P1602, B10CC), fuel pump, starter, battery or ECU.Wed, 15 Jul 2026 00:00:00 GMTimmobilizerkeyB1600P1610no startOBD-IIhttps://obdllm.com/en/blog/chinese-cars-obd-chery-geely-byd/https://obdllm.com/en/blog/chinese-cars-obd-chery-geely-byd/What OBD-II can do on Chery Tiggo, Geely Coolray, BYD Tang, Great Wall Haval: SAE J1979 standard, custom PIDs, GB codes, brand tools vs universal ELM327.Wed, 15 Jul 2026 00:00:00 GMTCheryGeelyBYDGreat WallChinese carsOBD-IIdiagnosticshttps://obdllm.com/en/blog/diesel-glow-plug-diagnostics-p0670-p0674/https://obdllm.com/en/blog/diesel-glow-plug-diagnostics-p0670-p0674/What glow plugs are, how OBD-II sees their state via P0670, P0671-P0678, why one dead plug ruins the whole cold start, and how much replacement costs on a 4-cyl diesel.Wed, 15 Jul 2026 00:00:00 GMTdieselglow plugsP0670P0671P0672P0673P0674cold starthttps://obdllm.com/en/blog/diesel-injector-correction-values-edc17/https://obdllm.com/en/blog/diesel-injector-correction-values-edc17/What IMA/injector correction code is, how EDC17 ECU learns each injector, codes P0263-P0272, what OBD-II reads, and why "just replace the injector" on diesel doesn't work.Wed, 15 Jul 2026 00:00:00 GMTdieselinjectorsEDC17correction valuescodingcommon-railhttps://obdllm.com/en/blog/dpf-diesel-particulate-filter-diagnostics/https://obdllm.com/en/blog/dpf-diesel-particulate-filter-diagnostics/What a DPF is, how it regenerates, which DTCs signal a problem (P2002, P244A, P244B), how to read soot levels via OBD-II, and why short trips kill diesel engines.Wed, 15 Jul 2026 00:00:00 GMTDPFparticulate filterP2002P244AregenerationdieselOBD-IIhttps://obdllm.com/en/blog/dpf-forced-regeneration-scanner-procedure/https://obdllm.com/en/blog/dpf-forced-regeneration-scanner-procedure/When passive/active DPF regen fails: how to run forced/stationary regen via VCDS, ISTA, Xentry or universal Autel. Safety, time, warnings.Wed, 15 Jul 2026 00:00:00 GMTDPFforced regenerationscannerVCDSISTAproceduredieselhttps://obdllm.com/en/blog/dtc-severity-levels-low-medium-high-critical/https://obdllm.com/en/blog/dtc-severity-levels-low-medium-high-critical/What DTC severity level means, how to tell "light from dust on the MAF" from "stop the engine now", which codes can wait, which are critical right now.Wed, 15 Jul 2026 00:00:00 GMTDTCseverity levelspriorityOBD-IIdiagnosticshttps://obdllm.com/en/blog/engine-oil-pressure-obd-p0521-p0524/https://obdllm.com/en/blog/engine-oil-pressure-obd-p0521-p0524/What OBD-II shows when oil pressure drops: P0520-P0524, difference between "high" and "low", when you can't drive another meter, worn pump, clogged filter or worn bearings.Wed, 15 Jul 2026 00:00:00 GMToil pressureP0521P0522P0524oil pumpengineOBD-IIhttps://obdllm.com/en/blog/ev-hybrid-obd-diagnostics-tesla-nissan-leaf/https://obdllm.com/en/blog/ev-hybrid-obd-diagnostics-tesla-nissan-leaf/What OBD-II can and can't do on electric vehicles: hybrid diagnostics for Toyota Prius, reading battery health on Nissan Leaf, Tesla's limitations, and the role of manufacturer CAN.Wed, 15 Jul 2026 00:00:00 GMTTeslaNissan Leafelectric vehiclehybridHV batteryOBD-IIlimitationshttps://obdllm.com/en/blog/fuel-trim-stft-ltft-explained/https://obdllm.com/en/blog/fuel-trim-stft-ltft-explained/What Short-Term (STFT) and Long-Term (LTFT) Fuel Trim mean, which values are normal, and how to diagnose a vacuum leak, dirty MAF or clogged injector from Fuel Trim numbers alone.Wed, 15 Jul 2026 00:00:00 GMTfuel trimSTFTLTFTfuel correctionP0171P0174diagnosticshttps://obdllm.com/en/blog/how-to-detect-odometer-fraud-through-obd/https://obdllm.com/en/blog/how-to-detect-odometer-fraud-through-obd/What OBD-II shows when the odometer says 50 000 mi but the real number is 150 000: ECU log audit, mismatch between ABS, ECM and cluster, motohours vs mileage, DTC history analysis.Wed, 15 Jul 2026 00:00:00 GMTodometermileage fraudCANOBD-IIused car buyinghttps://obdllm.com/en/blog/how-to-reset-service-intervals-obd/https://obdllm.com/en/blog/how-to-reset-service-intervals-obd/Step-by-step guide to reset the "Service in 500 mi" reminder on VW, BMW, Mercedes, Toyota. Button method vs diagnostic method, when online activation is needed, and why the dealer charges $80 for a 30-second job.Wed, 15 Jul 2026 00:00:00 GMTservice intervalmaintenance reminderresetOBD-IIservicehttps://obdllm.com/en/blog/how-to-spot-fake-elm327-clone-adapter/https://obdllm.com/en/blog/how-to-spot-fake-elm327-clone-adapter/Cheap "ELM327 v2.1" for $5 from AliExpress is a fake. How to spot the clone: "ATZ" test, protocol support, firmware version, real Elm Electronics chip vs Chinese clone.Wed, 15 Jul 2026 00:00:00 GMTELM327fakecloneidentifyOBD adaptergenuinehttps://obdllm.com/en/blog/hvac-climate-control-obd-deep-dive/https://obdllm.com/en/blog/hvac-climate-control-obd-deep-dive/Dual-zone climate control via OBD: codes B12xx, blend-door actuator state, mode-door, vent output temperature. How to diagnose "warm on the right — cold on the left".Wed, 15 Jul 2026 00:00:00 GMTHVACclimate controlmix doorservo motorOBD-IIdiagnosticshttps://obdllm.com/en/blog/manufacturer-coding-vag-bmw-mercedes/https://obdllm.com/en/blog/manufacturer-coding-vag-bmw-mercedes/What long coding on VAG (VCDS) is, byte coding on BMW (ISTA/E-Sys), Xentry SCN on Mercedes. Which features you can legally enable, risks, and how not to "brick" an ECU.Wed, 15 Jul 2026 00:00:00 GMTmanufacturer codingVCDSOBDelevenVAGBMWMercedeshidden featureshttps://obdllm.com/en/blog/motorcycle-obd-diagnostics-bmw-harley-yamaha/https://obdllm.com/en/blog/motorcycle-obd-diagnostics-bmw-harley-yamaha/What OBD-II can do on a bike: BMW Motorrad K1600 (16-pin OBD), Harley-Davidson (4-pin DDL), Yamaha K-Line, Ducati, KTM. Which adapters and specific codes are available.Wed, 15 Jul 2026 00:00:00 GMTmotorcyclemotorcycle OBDBMW MotorradHarleyYamahadiagnosticshttps://obdllm.com/en/blog/o2-oxygen-sensor-waveform-analysis/https://obdllm.com/en/blog/o2-oxygen-sensor-waveform-analysis/Visual analysis of upstream and downstream O2 sensor signals: normal oscillations, response signs, aging indicators, how to distinguish a "flat" curve from a real problem.Wed, 15 Jul 2026 00:00:00 GMTO2 sensorlambda sensorwaveformoscilloscopeP0130P0136diagnosticshttps://obdllm.com/en/blog/obd-adapter-wifi-vs-bluetooth-vs-ble/https://obdllm.com/en/blog/obd-adapter-wifi-vs-bluetooth-vs-ble/Comparison of three OBD-II adapter types for smartphones: WiFi ELM327, Bluetooth SPP Classic, Bluetooth Low Energy (BLE). Pros, cons, iOS and Android compatibility, price, and which one fits which scenario.Wed, 15 Jul 2026 00:00:00 GMTOBD adapterWiFiBluetoothBLEiPhoneAndroidcomparisonhttps://obdllm.com/en/blog/obd-data-logging-track-day-motorsport/https://obdllm.com/en/blog/obd-data-logging-track-day-motorsport/What to log on track via OBD-II (RPM, boost, oil temp, EGT, coolant), what rate (1 Hz vs 10 Hz), how not to lose data in corners, how to export into RaceRender / Trackaddict.Wed, 15 Jul 2026 00:00:00 GMTtrack daymotorsportdata loggingRaceRenderTrackaddictOBD-IIhttps://obdllm.com/en/blog/obd-freeze-frame-data-explained/https://obdllm.com/en/blog/obd-freeze-frame-data-explained/What OBD-II Freeze Frame data is, which parameters it captures, how to read the ECU snapshot, and why an experienced diagnostician looks at it before the trouble code itself.Wed, 15 Jul 2026 00:00:00 GMTFreeze FramesnapshotMode 02DTCdiagnosticsOBD-IIhttps://obdllm.com/en/blog/obd-mode-06-advanced-diagnostics/https://obdllm.com/en/blog/obd-mode-06-advanced-diagnostics/What OBD-II Mode 06 is, how to read on-board monitor test results (catalyst, O2, EGR) before a DTC appears, and why it's a secret weapon of professional diagnosticians.Wed, 15 Jul 2026 00:00:00 GMTMode 06advanced diagnosticsMIDTIDOBD-IIpre-DTChttps://obdllm.com/en/blog/p0128-thermostat-deep-dive/https://obdllm.com/en/blog/p0128-thermostat-deep-dive/Deep dive into P0128: when it appears, why thermostats fail stuck open, how to diagnose without teardown, and why a "cold" engine burns 10-15% more fuel.Wed, 15 Jul 2026 00:00:00 GMTP0128thermostatengine not warming upcoolantOBD-IIhttps://obdllm.com/en/blog/p0300-random-misfire-deep-dive/https://obdllm.com/en/blog/p0300-random-misfire-deep-dive/Deep dive into P0300: why misfires are "random", how to narrow 12 possible causes to one in 30 minutes, what the AI agent reads from Freeze Frame and Live Monitor.Wed, 15 Jul 2026 00:00:00 GMTP0300random misfiremisfirespark plugsignition coildiagnosticshttps://obdllm.com/en/blog/p0430-catalyst-bank-2-diagnostics/https://obdllm.com/en/blog/p0430-catalyst-bank-2-diagnostics/Difference between P0420 and P0430, when both appear together vs separately, how OBD-II sees bank 2, why V-engines fail asymmetrically, and repair cost.Wed, 15 Jul 2026 00:00:00 GMTP0430catalystbank 2V6V8lambdadiagnosticshttps://obdllm.com/en/blog/post-repair-verification-obd-checklist/https://obdllm.com/en/blog/post-repair-verification-obd-checklist/What to do after replacing an O2 sensor, catalyst, MAF or injector: run a drive cycle, read Freeze Frame, Mode 06, compare LTFT before/after — to be sure the repair is solid.Wed, 15 Jul 2026 00:00:00 GMTpost-repairverificationchecklistrepairOBD-II7 stepshttps://obdllm.com/en/blog/steering-angle-sensor-calibration/https://obdllm.com/en/blog/steering-angle-sensor-calibration/What steering angle sensor (SAS) is, how OBD-II sees its state, why calibration is mandatory after alignment, codes C1234, C1567, and how to do it in 5 min via scanner.Wed, 15 Jul 2026 00:00:00 GMTsteering angle sensorESPcalibrationC1512C1523alignmenthttps://obdllm.com/en/blog/timing-chain-vs-belt-dtc-codes/https://obdllm.com/en/blog/timing-chain-vs-belt-dtc-codes/How OBD-II sees a stretched timing chain or worn belt: codes P0016, P0017, P0018, P0019, symptoms, and why the AI agent can warn 3000 miles before the break.Wed, 15 Jul 2026 00:00:00 GMTtiming chaintiming beltP0011P0016P0017stretchenginehttps://obdllm.com/en/blog/tpms-relearn-procedure-per-make/https://obdllm.com/en/blog/tpms-relearn-procedure-per-make/Step-by-step TPMS relearn for Toyota, Honda, Ford, GM, VW, BMW, Mercedes, Hyundai, Nissan, Mazda. Auto-learn vs kombi-button vs OBD-relearn. Without TPMS-tool.Wed, 15 Jul 2026 00:00:00 GMTTPMSrelearntire pressure sensorsseasonal changeprocedurehttps://obdllm.com/en/blog/tpms-tire-pressure-monitoring-obd-diagnostics/https://obdllm.com/en/blog/tpms-tire-pressure-monitoring-obd-diagnostics/Direct vs indirect TPMS, codes C0750, C0755, C2126, how to read individual pressure and temperature per wheel via OBD-II, sensor battery life, replacement cost.Wed, 15 Jul 2026 00:00:00 GMTTPMStire pressureC0750C0755pressure sensorOBD-IIhttps://obdllm.com/en/blog/truck-obd-j1939-volvo-scania-mercedes/https://obdllm.com/en/blog/truck-obd-j1939-volvo-scania-mercedes/How to diagnose a truck via OBD: J1939 vs OBD-II, SPN/FMI codes, difference between light and heavy commercial vehicles, which adapters support J1939.Wed, 15 Jul 2026 00:00:00 GMTtrucksJ1939VolvoScaniaDAFMANSPNFMIhttps://obdllm.com/en/blog/turbo-diagnostics-p0299-p0234-underboost-overboost/https://obdllm.com/en/blog/turbo-diagnostics-p0299-p0234-underboost-overboost/How OBD-II sees the turbocharger: codes P0299, P0234, P0045, P0046. MAP sensor, VGT actuator, waste gate. Why turbos "die" and what to do about that side whistle.Wed, 15 Jul 2026 00:00:00 GMTturboP0299P0234underboostoverboostVGTdieselhttps://obdllm.com/en/blog/uds-mode-22-what-manufacturers-hide/https://obdllm.com/en/blog/uds-mode-22-what-manufacturers-hide/What UDS (Unified Diagnostic Services) ISO 14229 is, difference vs OBD-II, how Mode 22 reads DPF soot mass, VGT position, TPMS voltage — and why 90% of the "interesting stuff" lives here.Wed, 15 Jul 2026 00:00:00 GMTUDSMode 22ISO 14229manufacturer PIDsdiagnosticsOBD-IIhttps://obdllm.com/en/blog/uds-security-access-seed-key/https://obdllm.com/en/blog/uds-security-access-seed-key/What UDS SecurityAccess ($27) is, how seed-key challenge works, why some ops (read PID) are open but others (write, flash) require auth, and what's legally permitted.Wed, 15 Jul 2026 00:00:00 GMTUDSSecurityAccessseed-key$27ECU securitydiagnosticshttps://obdllm.com/en/blog/vag-long-coding-cheatsheet-vw-audi-skoda/https://obdllm.com/en/blog/vag-long-coding-cheatsheet-vw-audi-skoda/Ready-made VAG long coding cheatsheet (VW Golf, Audi A4, Skoda Octavia): activate cornering lights, comfort blinker, auto-lock, DRL, video-in-motion — bytes + bit positions.Wed, 15 Jul 2026 00:00:00 GMTVAGVCDSOBDelevenlong codingVWAudiSkodacodinghttps://obdllm.com/en/blog/vin-decoder-how-to-read-vehicle-identification-number/https://obdllm.com/en/blog/vin-decoder-how-to-read-vehicle-identification-number/Complete guide to reading VIN over OBD-II and decoding each of the 17 characters: manufacturer country, model, model year, engine type, trim and the check digit.Wed, 15 Jul 2026 00:00:00 GMTVINidentification numberWMIVDSVISdecoderhttps://obdllm.com/en/blog/winter-check-engine-common-cold-weather-codes/https://obdllm.com/en/blog/winter-check-engine-common-cold-weather-codes/Why Check Engine turns on in winter and disappears in summer: P0128 (thermostat), P0300 (cold-start misfire), P0442 (EVAP), P0507 (idle), P0116 and what to do with "seasonal" codes.Wed, 15 Jul 2026 00:00:00 GMTwinter diagnosticscoldcold startP0128P0562batteryhttps://obdllm.com/en/blog/car-diagnostics-vs-torque-pro/https://obdllm.com/en/blog/car-diagnostics-vs-torque-pro/What to pick for phone-based diagnostics: Car Diagnostics or Torque Pro. Feature comparison, accuracy, cost, and everyday driver support.Tue, 14 Jul 2026 00:00:00 GMTTorque ProCar DiagnosticscomparisonOBD-II appAndroidhttps://obdllm.com/en/blog/engine-stalls-while-driving-causes/https://obdllm.com/en/blog/engine-stalls-while-driving-causes/Engine suddenly dies while driving — under braking, at lights, on the motorway: how to find the cause in 15 minutes and whether you can keep driving.Tue, 14 Jul 2026 00:00:00 GMTengine stallsP0335P0340MAFdiagnosticsOBD-IIhttps://obdllm.com/en/blog/ford-common-dtc-codes/https://obdllm.com/en/blog/ford-common-dtc-codes/Catalogue of common Ford Focus, Fiesta, Kuga, Mondeo, Escape faults: EcoBoost turbo engines, PowerShift DCT, Duratec, TDCi diesels.Tue, 14 Jul 2026 00:00:00 GMTFordFocusFiestaKugaMondeoFord DTCdiagnosticshttps://obdllm.com/en/blog/mercedes-benz-common-dtc-codes/https://obdllm.com/en/blog/mercedes-benz-common-dtc-codes/Catalogue of common Mercedes C-Class, E-Class, GLK, GLC faults: OM651 diesel, M271/M276 petrol, 7G-Tronic, AirMatic.Tue, 14 Jul 2026 00:00:00 GMTMercedesMercedes-BenzW204W205W211W212DTCdiagnosticshttps://obdllm.com/en/blog/obd-readiness-monitors-explained/https://obdllm.com/en/blog/obd-readiness-monitors-explained/What OBD-II Readiness Monitors are, why cars fail inspection with "not ready" status even without any trouble codes, and how to run a proper drive cycle after battery disconnect or repair.Tue, 14 Jul 2026 00:00:00 GMTReadiness Monitorsystem readinessemissions testOBD-IImonitoringhttps://obdllm.com/en/blog/bmw-common-dtc-codes/https://obdllm.com/en/blog/bmw-common-dtc-codes/Catalogue of common faults on BMW 3-Series (E90, F30, G20) and 5-Series (E60, F10, G30): VANOS, timing chain, HPFP, DPF, injectors, electronics.Mon, 13 Jul 2026 00:00:00 GMTBMWE90F30G20N54N55BMW DTCdiagnosticshttps://obdllm.com/en/blog/car-wont-start-diagnosis/https://obdllm.com/en/blog/car-wont-start-diagnosis/Engine cranks but no fire — or dead silence: how to tell in 5 minutes whether it is the starter, the battery, fuel, plugs, immobiliser, or something deeper.Mon, 13 Jul 2026 00:00:00 GMTwon't startstarterbatteryP0335P0340diagnosticsOBD-IIhttps://obdllm.com/en/blog/diesel-power-loss-diagnosis/https://obdllm.com/en/blog/diesel-power-loss-diagnosis/Why a diesel car does not pull, how to quickly distinguish turbo, EGR, DPF or injector issues, and which DTC codes to read first.Mon, 13 Jul 2026 00:00:00 GMTdieselpower lossDPFturboEGRP0299diagnosticshttps://obdllm.com/en/blog/elm327-not-connecting-to-phone/https://obdllm.com/en/blog/elm327-not-connecting-to-phone/Step-by-step guide for drivers: why an OBD-II ELM327 adapter fails to pair with Android, how to distinguish BLE from Classic SPP, wrong PIN, device conflicts and what to do.Mon, 13 Jul 2026 00:00:00 GMTELM327BluetoothpairingphoneOBD adaptertroubleshootinghttps://obdllm.com/en/blog/engine-misfire-troubleshooting/https://obdllm.com/en/blog/engine-misfire-troubleshooting/Misfire symptoms explained: why the engine stumbles at idle and under load, how to identify the problem cylinder, which DTC codes to read first.Mon, 13 Jul 2026 00:00:00 GMTmisfireP0300P0301P0302spark plugsignition coilhttps://obdllm.com/en/blog/exhaust-smoke-colors-diagnosis/https://obdllm.com/en/blog/exhaust-smoke-colors-diagnosis/Decoding tailpipe smoke colour: how to tell in 30 seconds whether it is condensation, oil burning, rich mixture or a blown head gasket.Mon, 13 Jul 2026 00:00:00 GMTexhaust smokewhiteblueblackcolorsengine diagnosticshttps://obdllm.com/en/blog/fluctuating-idle-rpm-causes/https://obdllm.com/en/blog/fluctuating-idle-rpm-causes/Idle rpm not stable — swings between 700 and 1200: how to identify the cause in 10 minutes — MAF, IAC, EGR, injectors, vacuum leak.Mon, 13 Jul 2026 00:00:00 GMTidlefluctuating RPMP0505P0506P0507IAC valvehttps://obdllm.com/en/blog/fuel-consumption-increased-causes/https://obdllm.com/en/blog/fuel-consumption-increased-causes/Sudden fuel-use increase: which DTC codes and live parameters to watch, how to distinguish worn engine from a clogged filter.Mon, 13 Jul 2026 00:00:00 GMTfuel consumptionMPGoxygen sensorMAFinjectorsdiagnosticshttps://obdllm.com/en/blog/how-to-reset-check-engine-without-scanner/https://obdllm.com/en/blog/how-to-reset-check-engine-without-scanner/Three ways to clear the Check Engine light without a diagnostic scanner: battery disconnect, the "40 drive cycles" method, and why you should not do it without proper diagnostics.Mon, 13 Jul 2026 00:00:00 GMTCheck Engineresetwithout scannerbattery resetP-codehttps://obdllm.com/en/blog/oil-leak-diagnosis-causes/https://obdllm.com/en/blog/oil-leak-diagnosis-causes/Found an oil stain under the car: how to identify in 20 minutes which gasket or seal is leaking, and how much repair costs.Mon, 13 Jul 2026 00:00:00 GMToil leakoilsealgasketenginediagnosticshttps://obdllm.com/en/blog/renault-common-dtc-codes/https://obdllm.com/en/blog/renault-common-dtc-codes/Catalogue of common Renault Megane, Duster, Logan, Sandero, Captur faults: EGR, DPF, 1.5 dCi injectors, TCe turbo, UCH electronics.Mon, 13 Jul 2026 00:00:00 GMTRenaultMeganeDusterLoganRenault DTCdiagnosticshttps://obdllm.com/en/blog/skoda-common-dtc-codes/https://obdllm.com/en/blog/skoda-common-dtc-codes/Catalogue of common Skoda Octavia A5/A7, Fabia, Yeti, Superb faults: TSI engines, DPF, DSG, EPC, VAG platform shared with Volkswagen.Mon, 13 Jul 2026 00:00:00 GMTSkodaOctaviaFabiaYetiSkoda DTCdiagnosticshttps://obdllm.com/en/blog/steering-wheel-vibration-causes/https://obdllm.com/en/blog/steering-wheel-vibration-causes/Steering wheel vibration at 60, 90, 120 km/h: how to tell in 5 minutes whether it is wheels, brakes, CV joint, wheel bearing, or the engine.Mon, 13 Jul 2026 00:00:00 GMTsteering wheel vibrationwheel balancebrake discssuspensiondiagnosticshttps://obdllm.com/en/blog/toyota-common-dtc-codes/https://obdllm.com/en/blog/toyota-common-dtc-codes/Catalogue of common Toyota Camry, Corolla, RAV4, Prius faults: oxygen sensors, catalyst, DPF, VVT-i, hybrid system, EGR.Mon, 13 Jul 2026 00:00:00 GMTToyotaCamryCorollaRAV4PriusToyota DTCdiagnosticshttps://obdllm.com/en/blog/volkswagen-common-dtc-codes/https://obdllm.com/en/blog/volkswagen-common-dtc-codes/Catalogue of typical VW Golf, Passat, Polo, Tiguan faults: EPC, ABS, DPF, EGR, ignition coils, TSI engines. With DTC codes, symptoms and repair.Mon, 13 Jul 2026 00:00:00 GMTVolkswagenVWGolfPassatPoloVW DTCdiagnosticshttps://obdllm.com/en/blog/ai-car-diagnostics-how-it-works/https://obdllm.com/en/blog/ai-car-diagnostics-how-it-works/How Car Diagnostics AI works: eight specialised agents analyse DTC codes, predict failures, generate reports, and answer questions — inside a microservice architecture.Fri, 10 Jul 2026 00:00:00 GMTAIcar diagnosticsOBD-IIDTCAI agentsmobile apphttps://obdllm.com/en/blog/audi-a3-brake-light-warning/https://obdllm.com/en/blog/audi-a3-brake-light-warning/Detailed guide to Audi A3 brake warning lights: red brake symbol, yellow brake pad wear indicator, common faults like wheel-speed sensor failure, and step-by-step diagnostic advice.Fri, 10 Jul 2026 00:00:00 GMTAudi A3brake warning lightbrakesESPC1210Audi diagnosticshttps://obdllm.com/en/blog/bmw-5-series-warning-lights/https://obdllm.com/en/blog/bmw-5-series-warning-lights/A practical guide to BMW 5 Series dashboard warning lights across E60, F10, and G30 generations: colour meanings, how to respond, and the most common faults behind each indicator.Fri, 10 Jul 2026 00:00:00 GMTBMW 5 SeriesF10G30dashboardiDriveBMW diagnosticshttps://obdllm.com/en/blog/car-battery-warning-lights/https://obdllm.com/en/blog/car-battery-warning-lights/Complete guide to car battery and charging system warning lights: what the red battery symbol means, the difference between red and amber indicators, and how to diagnose charging faults before they leave you stranded.Fri, 10 Jul 2026 00:00:00 GMTbattery warning lightbattery lampchargingalternatorOBD-IIhttps://obdllm.com/en/blog/car-diagnostics-smartphone-guide/https://obdllm.com/en/blog/car-diagnostics-smartphone-guide/Turn your smartphone into a diagnostic scanner: choosing an adapter, installing the app, running your first scan, decoding trouble codes, and viewing live telemetry.Fri, 10 Jul 2026 00:00:00 GMTsmartphone diagnosticsmobile OBDELM327AndroidiPhoneguidehttps://obdllm.com/en/blog/check-engine-light-what-to-do/https://obdllm.com/en/blog/check-engine-light-what-to-do/A driver's step-by-step guide: what the Check Engine light means, how to read DTC codes without a scanner, when it is safe to keep driving, and when to call a tow truck.Fri, 10 Jul 2026 00:00:00 GMTCheck EngineMILP0300P0420diagnosticsstep-by-stephttps://obdllm.com/en/blog/epc-warning-light/https://obdllm.com/en/blog/epc-warning-light/Everything you need to know about the EPC (Electronic Power Control) light on Volkswagen, Audi, Škoda, and SEAT vehicles: common causes, how to diagnose it, and whether you can keep driving.Fri, 10 Jul 2026 00:00:00 GMTEPCElectronic Power ControlVAGVWAudiSkodathrottle bodyhttps://obdllm.com/en/blog/how-to-choose-elm327-adapter/https://obdllm.com/en/blog/how-to-choose-elm327-adapter/The complete guide to choosing an OBD-II adapter: ELM327 v1.5 vs v2.1, STN1110, Vgate iCar Pro, BLE vs Bluetooth SPP, counterfeit red flags, and Car Diagnostics compatibility.Fri, 10 Jul 2026 00:00:00 GMTELM327OBD adapterbuying guide2026fakeshttps://obdllm.com/en/blog/obd2-protocols-explained/https://obdllm.com/en/blog/obd2-protocols-explained/ISO 9141-2, KWP2000, J1850 PWM, J1850 VPW, CAN — how they work, which cars use them, and why protocol support matters when choosing an adapter.Fri, 10 Jul 2026 00:00:00 GMTOBD-IIprotocolsCANISO 15765ISO 9141J18505 protocolshttps://obdllm.com/en/blog/p0420-catalyst-code-explained/https://obdllm.com/en/blog/p0420-catalyst-code-explained/A detailed breakdown of code P0420: what "catalyst efficiency below threshold" means, common causes, how to diagnose it, repair costs, and whether you can keep driving.Fri, 10 Jul 2026 00:00:00 GMTP0420catalystefficiencylambdacatalytic converterOBD-IIhttps://obdllm.com/en/blog/peugeot-308-dashboard-warning-lights/https://obdllm.com/en/blog/peugeot-308-dashboard-warning-lights/Complete reference guide to the 16 dashboard warning lights on a Peugeot 308: colour coding, what each signal means, and the exact action you should take — from the red STOP light to the amber low-fuel indicator.Fri, 10 Jul 2026 00:00:00 GMTPeugeot 308dashboardwarning lightsPeugeot diagnosticsSTOP