P229F – NOx Sensor 2 Out of Range (Bank 1)

Description

The ECM detects out‑of‑range readings from NOx sensor 2 on bank 1.

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Symptoms

  • Poor fuel economy
  • Reduced power
  • Check engine light

Causes

  • Faulty NOx sensor
  • Wiring issues
  • Sensor contamination

Diagnosis

  • Test NOx sensor
  • Inspect wiring
  • Check SCR system

Repair

  • Replace sensor
  • Repair wiring