Symptoms of P0143 OBD II Trouble Code
- MIL (Malfunction Indicator Lamp) illumination
- Engine performance issues
- Engine running rough
- Engine running rich
- Poor idle
Common Causes of P0143 OBD II Trouble Code
- Air leaks in exhaust in front of o2 sensor giving false reading
- O2 sensor connector damaged
- O2 sensor signal circuit is shorted to ground
- O2 sensor ground circuit is open
- O2 sensor has failed (it may be contaminated with fuel or coolant)
- PCM has failed