Po446-Evap canister vent control valve circuit fault & P0136- Downstream oxygen sensor or circuit fault. My car drivers like its running hard to accelarate. I rest my PCM and the codes where gone for about 2or3days and the service light came back on. Is this something i should fix right away or something i should have the stealer ship look at?

 

check if your gas cap is on tight, and replace your O2 sensor.

 

Thanks I'll change my 02 sensor and check the gas cap. But why does it feel like its running ruff? The o2 sensor?