Engine-Codes - Generic - P121E

P121E - Nitrogen Oxide Sensor Linear Oxygen Sensor Line Disconnection

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

P121E 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 do I fix code P121E

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 P121E code

Labor: 1.0

The cost of diagnosing the P121E 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)

P121E 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.

P121E More Information

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Information for specific makes

  • P121E BMW Nitrogen Oxide Sensor Linear Oxygen Sensor Line Disconnection
  • P121E MINI Nitrogen Oxide Sensor Linear Oxygen Sensor Line Disconnection

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