What does code P0131 mean?
The front oxygen sensor reports low voltage indicating lean mixture or weak signal.
OBD-II Code
P0131 — Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 1
The front oxygen sensor reports low voltage indicating lean mixture or weak signal.
Common symptoms
- Lack of power
- hesitation
- lean mixture
Possible causes
- Wiring shorted to ground
- weak oxygen sensor
- intake air leak
Initial recommendation
Check wiring, repair intake or exhaust leaks, evaluate sensor replacement.
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 P0131 with your vehicle's actual symptoms for more complete diagnostic guidance.
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