What does code P0143 mean?
Low voltage detected from oxygen sensor B1S3 indicating lean mixture or weak signal
OBD-II Code
P0143 — Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 3
Low voltage detected from oxygen sensor B1S3 indicating lean mixture or weak signal
Common symptoms
- Minor power loss
- hesitation
- check engine light
Possible causes
- Exhaust leak
- weak sensor
- signal wire shorted to ground
Initial recommendation
Inspect exhaust leaks, check wiring and replace sensor if necessary.
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 P0143 with your vehicle's actual symptoms for more complete diagnostic guidance.
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