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O2 Sensor Circuit Malfunction Bank1 Sensor2

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1 source
  • Official data (NHTSA)official_feed

What P0136 means

Safe to drive short-term

The downstream (post-catalyst) oxygen sensor on bank 1 is out of range. This sensor monitors catalytic-converter efficiency rather than controlling fuel trim, so a fault here usually shows up as a catalyst-related warning and has little direct effect on how the engine drives.

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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 Sensor2

What to check first

  1. Scan-tool live downstream O2 data
  2. Inspect wiring and connector
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