What does code P0172 mean?
The air fuel mixture is excessively rich on bank 1
OBD-II Code
P0172 — System Too Rich Bank 1
The air fuel mixture is excessively rich on bank 1
Common symptoms
- Fuel odor
- dark exhaust smoke
- high fuel consumption
Possible causes
- Leaking injector
- high fuel pressure
- slow oxygen sensor
- faulty regulator
Initial recommendation
Inspect injectors, verify fuel pressure and oxygen sensor operation.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0172 with your vehicle's actual symptoms for more complete diagnostic guidance.
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