What is the P0131 error code?

The engine control module monitors the signal circuit of the upstream oxygen sensor during closed-loop operation to verify dynamic fuel control. A fault is registered when the signal remains below a calibrated threshold indicating a lean condition for an extended observation period, failing to transition during commanded fuel corrections.

What does P0131 mean?

The engine control module has detected that the primary oxygen sensor on Bank 1 is continuously reporting an abnormally low signal, indicating an excessively lean fuel mixture. This can result in unstable engine operation, sluggish acceleration, and reduced fuel economy as the computer attempts to compensate for the perceived lack of fuel.

System Faults

Diagnostic Reasoning

An engineering-focused reference for the interpretation of automotive fault logic. We prioritize diagnostic methodology over component replacement.

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