What does code P0170 mean?
The ECU detects fuel trim corrections for bank 1 outside acceptable limits
OBD-II Code
P0170 — Fuel Trim Malfunction Bank 1
The ECU detects fuel trim corrections for bank 1 outside acceptable limits
Common symptoms
- Hesitation
- increased fuel consumption
- lean or rich mixture
- unstable idle
Possible causes
- Vacuum leaks
- dirty MAF sensor
- low or high fuel pressure
- dirty injectors
Initial recommendation
Inspect MAF sensor, intake vacuum leaks, fuel pressure and injector condition.
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 P0170 with your vehicle's actual symptoms for more complete diagnostic guidance.
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