Engine-Codes - Bmw - P121F BMW

P121F BMW - Nitrogen Oxide Sensor Linear Oxygen Sensor Short Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P121F BMW Possible Causes

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

How is the P121F BMW code repair?

Start by checking 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.

What is the cost to diagnose the P121F BMW code

Labor: 1.0

The cost to diagnose the P121F BMW 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)

P121F BMW Meaning

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

More Information

Need more information on how to fix the P121F BMW code?
Get Access to Factory Service Manuals

Need more help?

Get the P121f Bmw code diagnosed by a professional: Find a repair shop in your area