i have a SES light on so i went to autozone to have the codes checked then i came home and looked them up in the dtc sticky they are p0200 (injector circuit), p0420 (catalyst efficiency low bank 1) and po442 (evap system)
Does anyone have any ideas on where to start to fix all of these they seem related so maybe the injector is causing the cat code? i'v been looking for vacuum leaks and cracks around the evap hoses and the canister but so far nothing... any help would be greatly appreciated

 

so 102 people looked at this and nothing

 

Maybe, start by posting what vehicle, mods if any, etc????

 

This is just day to day stuff that your trusty mechanic will be able to take a look at and diagnose; not really performance related.

 

2002 Camaro Z28 a-4 slp lid is the only mod... James Linder why in the hell would i take the car to my untrusty mechanic pay him $75 and hr. just to find out that i need and 02 sensor and a gas cap.

 

i was un aware that pcm and tuning was only for performance related threads