What does code P0151 mean?
Low signal voltage detected from the front oxygen sensor B2S1 indicating lean mixture
OBD-II Code
P0151 — Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 1
Low signal voltage detected from the front oxygen sensor B2S1 indicating lean mixture
Common symptoms
- Loss of power
- hesitation
- lean condition
Possible causes
- Exhaust leak
- weak oxygen sensor
- ground wire issue
Initial recommendation
Check for exhaust leaks and inspect wiring.
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 P0151 with your vehicle's actual symptoms for more complete diagnostic guidance.
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