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DTC DATABASE • OBD-II
P2202

NOx Sensor Circuit Low Bank 1

This page explains common reasons this code appears and what should be checked before parts are replaced.

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Common causes

What can trigger P2202?

  • NOx sensor electrical fault
  • Harness short to ground
  • Sensor control module fault
Typical symptoms

What you may notice

  • SCR warning
  • NOx reading missing or implausible

Do not diagnose from the code alone

The code alone does not identify the failed part. Live data, wiring checks and manufacturer-specific subcodes may be required before replacing components.

Full scanLive dataWiring checksSensor plausibilityECU / module communication
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