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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.