NOx Sensor Fault Code List and Common Meanings

The codes related to a NOx sensor depend on the make and model of the vehicle and the specific diagnostic system used. Here are some common codes that may indicate a faulty NOx sensor:

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• P2202: NOx Sensor Circuit Low Input
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• P2203: NOx Sensor Circuit High Input
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• P2204: NOx Sensor Circuit Intermittent Input
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• P2205: NOx Sensor Circuit
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• P2206: NOx Sensor Signal Biased/Stuck Lean
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• P2207: NOx Sensor Signal Biased/Stuck Rich
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• P229F: NOx Sensor Circuit Range/Performance Bank 1
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• P22A0: NOx Sensor Circuit Bank 1
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These codes can indicate various issues with the NOx sensor or its wiring, and a diagnostic scan by a professional mechanic is usually necessary to determine the exact cause of the problem.