Hey guys,

I installed a hks knockoff cat-back system, and my check engine light came on. I thought that only happens when you touch the cats, can someone shed some light here? Mods are only jwt popcharger, and the exhaust, and the car is an 03 which I thought never really throw cel's for that stuff anyways.

If anyone could give me some ideas what it could be and how to fix it please let me know, im going to go get the code ran later today.

 

come back with codes....then we can help more

 

i got it checked before i went to work, it says that its a bad o2 sensor. i dont understand how that is possible its not like i put in test pipes or even touched an o2 sensor. ill get an exact code soon.

 

p0577 can someone give me some insight