P127A BMW - Nitrogen Oxide Sensor Overrun Test NOx Signal Too High

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Nitrogen Oxide Sensor (NOx)
  • Nitrogen Oxide Sensor (NOx) harness is open or shorted
  • Nitrogen Oxide Sensor (NOx) circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P127a Bmw Description

The Engine Control Module (ECM) monitors the Nitrogen Oxide Sensor (NOx). The ECM sets the OBDII code when the Nitrogen Oxide Sensor (NOx) is not to factory specifications.
OBDII Code P127a Bmw - Nitrogen Oxide Sensor Overrun Test NOx Signal Too High - AutoCodes.com

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