P118A Possible Causes
- Exhaust leaks
- Faulty oxygen sensor
- Oxygen sensor harness is open or shorted
- Poor electrical connection in oxygen sensor circuit
How to Fix Code P118A?
Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or service engine soon warning light)
P118A Meaning
The Engine Control Module (ECM) monitors the oxygen sensor. The ECM sets the OBDII code when the oxygen sensor does not meet factory specifications.