Question

I just had a valve job done and now I'm getting a P0422 code on my 2000 Kia Sephia 1.8L

Answer 1

P0422 - Main Catalyst Efficiency Below Threshold Bank 1

- Warm Up Three Way Catalytic converter deterioration or malfunction
- Exhaust system leaks
- Loose front or rear HO2Ss
- Faulty front heater O2 sensor
- O2 sensors harness is open or shorted
- O2 sensors poor electrical connection
 

check for loose O2 sensor and wires first. if its not either it coulde be the o2 sensor

Comments

Thank you for your insight. I'll check out the harness to the O2 sensor since it was removed so the head could be pulled.