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DTC DATABASE • OBD-II
P229F

NOx Sensor Circuit Range/Performance Bank 1 Sensor 2

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 P229F?

  • Downstream NOx sensor fault
  • SCR efficiency problem
  • Wiring / control module issue
Typical symptoms

What you may notice

  • AdBlue/SCR warning
  • Efficiency faults
  • Possible countdown

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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