Mercedes A‑Class (W169/W176/W177)
Common A‑Class faults, drivability patterns and typical OBD2 codes.
What to expect
- Turbo petrol: intermittent misfires can be coil/plug related before injector issues.
- Diesel CDI: DPF faults often relate to inhibited regen (voltage/temperature/previous faults).
- Electrical sensitivity: low voltage can cause plausibility codes across modules.
Typical OBD2 codes for this model
P0300
Random misfire – ignition vs fuel vs airflow checks.
P0171
Lean running – unmetered air vs fuel delivery.
P2002
DPF efficiency – soot vs sensor drift.
Use the AI tools
Tip: If you have multiple codes, start with the code that appeared first, then use the Diagnostic Assistant with your symptoms and mileage.
Trust note: These profiles are designed to narrow possibilities. Confirm with test data (trims, misfire counters, pressure/smoke tests, voltage checks) before buying parts.