Guides on OBD2 error codes, ELM327 setup, live data PIDs, used-car checks, and AIscanAuto updates.
How to read fuel trim, O2, and MAF live PIDs—and when logging beats a one-time snapshot.
What to scan, which monitors matter, and how pending codes help you negotiate a fair price.
Why idle feels rough, which DTCs and PIDs to watch, and how to separate misfire from mounts or fuel issues.
ELM327 pairing, Bluetooth vs USB vs Wi‑Fi, and first checks after you connect an OBD2 adapter.
Criteria for the best OBD2 scanner apps: platforms, PIDs, AI guidance, pricing—plus a link to our detailed comparison.
What P0420 means, common causes beyond the catalytic converter, and how live OBD2 data guides diagnosis.
How to read OBD2 DTCs, generic vs manufacturer codes, and a safe diagnostic workflow with ELM327.