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:

• P2202: NOx Sensor Circuit Low Input
• P2203: NOx Sensor Circuit High Input
• P2204: NOx Sensor Circuit Intermittent Input
• P2205: NOx Sensor Circuit
• P2206: NOx Sensor Signal Biased/Stuck Lean
• P2207: NOx Sensor Signal Biased/Stuck Rich
• P229F: NOx Sensor Circuit Range/Performance Bank 1
• P22A0: NOx Sensor Circuit Bank 1

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.