P122E Possible Causes
- Faulty nitrogen oxide sensor Binary oxygen sensor
- Nitrogen oxide sensor Binary oxygen sensor harness open or shorted
- Nitrogen oxide sensor Binary oxygen sensor circuit poor electrical connection
How to Fix Code P122E?
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)
P122E Meaning
The Engine Control Module (ECM) monitors the nitrogen oxide sensor’s binary oxygen sensor. The ECM sets the OBDII code when the nitrogen oxide sensor’s binary oxygen sensor does not meet factory specifications.