P0172 — System Too Rich (Bank 1)
Reviewed1 source
1 source
- Official data (NHTSA)official_feed
What P0172 means
Caution — monitor closely
Long-term fuel trim has gone negative — the ECU keeps reducing fuel to compensate for excess fuel or insufficient air.
Driveability assessment not yet available. Get a personalized AI Second Opinion for your exact car.
General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- MAF sensor over-reporting airflow
- Leaking fuel injector
Symptoms
- Gasoline smell
- Повышенный расход топлива
- Black smoke from the exhaust
Cost data coming soonUpload your estimate to check if the price is fair