A Seven X

iTrader: (27)

So I have a 2001 camaro v6 auto has 130,000 miles.

About 2 months ago i was getting a p0420 code so i Replaced all o2 sensors brand new magnaflow obd 2 catalytic converter

Now I'm getting a p0420 again!? What could be the problem!?

MJs1FastSS

iTrader: (149)

its your pcm you most likely will need to get it flashed

A Seven X

iTrader: (27)

It's getting really crappy has mileage to I don't need to tune the trans am to break u off mike lol

MJs1FastSS

iTrader: (149)

i told you ill give you 8 cars .... but on a side note im heading up that way early in the morning.

my first thought is a faulty 02 (even with them being new, one could be bad? )

the 02 sensors in the front and rear of the cat could be getting the same reading thus throwing that code. on your scanner did it say right or left side or was it just that scpecific p0420 code that pulled up

A Seven X

iTrader: (27)

Specific p0420 says cat efficiency

mannyman84

iTrader: (2)

First you messed up by changing all 02s by getting p0420. Should of checked data to see how your front and rear o2's are fluctuating. All it was was an inefficient cat, second that aftermarket cat could be faulty if it sees the same activity on the front and rear o2.

mannyman84

iTrader: (2)

And Are the o2's ACdelco? I've had a lot of problems with aftermarket o2's and also make sure you don't have any exhaust leaks by the o2 sensors and the cat