Thread: p0420 code on

Seems i got a drop in converter efficiency in B1S2. I do have a magnaflow hi-fo cat installed a few months back when i had the pacesetter headers installed but just recently this DTC came on. i currently have it as No-Reporting in the PowrTuner, but was wondering if its a cause of concern, seeing that its the Post-Cat and not the Pre-Cat.

Originally Posted by fst

Seems i got a drop in converter efficiency in B1S2. I do have a magnaflow hi-fo cat installed a few months back when i had the pacesetter headers installed but just recently this DTC came on. i currently have it as No-Reporting in the PowrTuner, but was wondering if its a cause of concern, seeing that its the Post-Cat and not the Pre-Cat.

Not to worry. Setting that code to no reporting is fine, when you have a hi-flow cat.

thanks for the info

Yeah, I wouldn't worry about it. I have a magnaflow high flow cat and never got this code. But if I did, I wouldn't worry. Many people totally get rid of their after cat O2 since it doesn't do a thing but put up those stupid lights from time to time.