P122C Possible Causes
- Faulty nitrogen oxide sensor
- Nitrogen oxide sensor harness is open or shorted
- Poor electrical connection in the nitrogen oxide sensor circuit
How is Code P122C Repaired?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check Engine Light On (or Service Engine Soon Warning Light)
P122C Meaning
The Engine Control Module (ECM) monitors the nitrogen oxide sensor. The ECM sets the OBDII code when the nitrogen oxide sensor does not meet factory specifications.