Home / OBD-II Codes / P0156
OBD-II Code

P0156 — Oxygen Sensor Circuit Malfunction Bank 2 Sensor 2

General fault detected in the rear oxygen sensor B2S2

System Engine
Severity Low
Safe to drive? Yes, with caution
Advanced scanner Not necessarily

What does code P0156 mean?

General fault detected in the rear oxygen sensor B2S2

Common symptoms

  • Few symptoms
  • check engine light

Possible causes

  • Faulty oxygen sensor
  • broken wiring
  • exhaust leak before sensor

Initial recommendation

Inspect wiring and exhaust leaks, replace oxygen sensor.

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 P0156 with your vehicle's actual symptoms for more complete diagnostic guidance.

Go to the app View more codes