Timing chain vs belt: DTC codes that warn of stretch before catastrophe
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.
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TPMS relearn: how to "teach" new tire-pressure sensors after seasonal swap — 10 brands
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.
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TPMS via OBD-II: why the "yellow circle" turned on and how to diagnose tire-pressure sensors
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.
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OBD on trucks: SAE J1939, Volvo/Scania/DAF/MAN — standard and specifics
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.
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Turbo diagnostics: P0299 (underboost) and P0234 (overboost) — 8 causes
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.
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UDS Mode 22: what manufacturers hide beyond the OBD-II standard
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.
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UDS SecurityAccess: how seed-key challenge protects the ECU and why "hacking" isn't that simple
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.
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VAG long coding cheatsheet: 15 popular codings for VW, Audi, Skoda via VCDS/OBDeleven
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.
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VIN decoder: how to read a Vehicle Identification Number and what it tells you about the car
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.
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Winter Check Engine: 7 typical codes that only appear in the cold
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.
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Car Diagnostics vs Torque Pro: Detailed OBD-II App Comparison 2026
What to pick for phone-based diagnostics: Car Diagnostics or Torque Pro. Feature comparison, accuracy, cost, and everyday driver support.
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Engine Stalls While Driving: 10 Causes and Urgent Diagnosis
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.
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