Thanks. I'll check the wiring.

Hi. Not sure if I am posting this in the right spot - I have a 2005 Vibe base. I was getting a p0420. I replaced the upstream oxygen sensor and the p0420 code came back. I replaced the downstream oxygen sensor (Denso) , the p0420 is gone, but now I am getting a p2238 code. Can anyone tell me what di...