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O2 Sensor Circuit Malfunction Bank1 Sensor1

Verified1 source
1 source
  • Official data (NHTSA)official_feed

What P0130 means

Caution — monitor closely

The upstream (pre-catalyst) oxygen sensor on bank 1 is out of range. This is the primary sensor the engine uses for closed-loop fuel trim, so a fault here directly affects the air-fuel mixture and can cause rough running, poor economy, or a rich/lean condition.

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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 Bank1 Sensor1

What to check first

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