Engine-Codes - Generic - P123E

P123E - Nitrogen Oxide Sensor Sensor Poisoning NOx Signal Too Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?

P123E Possible Causes

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

How do I fix code P123E

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P123E code

Labor: 1.0

The cost of diagnosing the P123E code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

P123E Meaning

The Engine Control Module (ECM) monitors the Nitrogen Oxide Sensor. The ECM sets the OBDII code when the Nitrogen Oxide Sensor is not to factory specifications.

P123E More Information

Need more information on how to fix the P123E code?
Get Access to Factory Service Manuals

Information for specific makes

  • P123E BMW Nitrogen Oxide Sensor Sensor Poisoning NOx Signal Too Low
  • P123E MINI Nitrogen Oxide Sensor Sensor Poisoning NOx Signal Too Low

Need more help?

Get the P123e code diagnosed by a professional: Find a repair shop in your area