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O2 Sensor Circuit Malfunction Bank2 Sensor1

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1 source
  • Official data (NHTSA)official_feed

What P0150 means

Caution — monitor closely

The upstream (pre-catalyst) oxygen sensor on bank 2 is out of range. Bank 2 exists only on V-configuration engines (the cylinder bank not containing cylinder 1), so there this is the bank-2 counterpart of the primary fuel-trim sensor; on inline engines the code more often points to a wiring or sensor-assignment fault.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

Common causes

  • O2 Sensor Circuit Malfunction Bank2 Sensor1

What to check first

  1. Scan-tool live O2 sensor data bank 2
  2. Inspect exhaust manifold bank 2
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