P0420

Im driving back from MD with my car and I get off the my exit in GA. As soon as I get off the check engine light comes on and the cruise control light is flashing. I went to autozone and had them pull the code. It's a P0420. Anyone ever run across this? Could be a bad O2 sensor, ignition system or A/F ratio is what they said.

 

Do you have a catless downpipe?

 

Stock downpipe

 

question is do you have an AP or open source tune? The code can be turned off

 

yeah but why is it coming up to begin with when he has a stock downpipe. Clear the code and see if it comes back. It might have been a fluke.

 

Probably a bad O2 sensor.

You could also try cleaning your maf.

 

I don't have either.

 

Most definitely if the rest of the car is stock.

 

So, the check engine light went off yesterday. I didn't do anything. works for me.

 

It will go off after a few hours of driving. I would get it cleared and then see if it comes back on.

 

The weird thing is that the light was on for about 4 days and then just went off yesterday.

 

it does that. doesnt mean the O2 magically fixed itself. its still in there.

 

I'll have autozone clear the code and then see what happens.

 

o2 doesn't fix itself....it just didn't pop that code again in so many drive cycles.

If you as much as look at the o2, it'll die on you :|