bmair

Hi,

I have been having issues passing emissions. My check engine light has been on and I had the front O2 A/F sensors replaced with both Bosch A/F Wideband Upstream Sensors. Now I am still getting P0420 and P0430 codes and Check engine light came back on. Looks at efficiency and it is as follows. Bank 1 STFT: 0.7% LTFT: -2.3% , Bank 2 STFT: 7.0% LTFT: -2.3%..

I had a diagnostic performed and they said they would recommend replacing the downstream sensors before thinking it was an issue with the cat.

As they were charging over 300+ than I could get it replaced for, I had a mechanic look at it and he couldn't pinpoint where the downstream sensors are.

Can someone tell me where these sensors are and maybe include a picture of them????


That would be extremely helpful.

I think and HOPE that once these are replaced these two codes go away.

Let me know if anymore information is needed.

Regards,
Brandon