2nd Gen R56 Cooper S Most liked posts in thread: Is the P0420 error a true catalyst failure?

I don't think the car is being coy...

What makes you think it's something else when the code is for cats?

That's the same code I got when I hacked them out...

You could spend some guap replacing them, or save some guap deleting them...

That code is telling you it's time to start modding..

 

It could be a faults reading from one of your O2 sensors. (you have two) :idea:

Take them our and switch them ( Pre Cat and Post Cat) and clear all adaptations and test by driving around for a few hundred miles.

I really do not think you CAT has failed at all. CAT failures are very rare.

 

Not as rare as u think, I kilt my cats when my car was sucking oil...

The first cat in the dp gets hella dirty :shocked:

Wouldn't bad o2 sensors throw an o2 sensor code?

I thought po420 had to do with pressure differentials between o2 sensors right?

 

http://www.p0420.com/

 

No psi sensors on a 02 sensor....

 

Yup, the first O2 looks to be failing or failed.

 

How is your oil consumption ?
Many times a turbo fails....often with a leaking seal...and it DOES cover the cat with oil....
Think you had a failing turbo thread?

And the check-engine light is CAUSED by the cat code...how else would you know too check it?!
Ouch......just have to say it...what have you been drinking? It must be pretty strong!

 

Ya bad turbo seals can kill your cat. Or bad valve guides, rings, cylinders, and pcv.

My car had all of the above and my cat died. Dead.

Your primary cat sits directly underneath, very close to the turbo and is known to kill seals due to back pressure. They also create massive heat in that little hell tunnel. Might want to consider ending the cats before they end your cash flow. Your cat is plotting to kill your turbo as we speak

U could get a catless dp and a tune for around the same price as OEM replacement. :ihih:

 

This is a how you can tell if you have a dead cat.

Look for the tracks.

 

If your catalytic converter is plugged, you will have loss of power.

As I remember you had a noisy turbocharger, a bad seal in the turbo will leak oil all over the inside of the catalytic converter and plug it up when the oil burns inside the cat.

Did you ever change out your turbocharger?.

 

Oil leaking through a bad turbocharger seal has nowhere else to go but through the catalytic converter.
That oil will burn up in the catalytic converter and reduce flow, causing performance problems.

 

The back pressure on the exhaust turbine from the cat will wear the pressure seals paper thin. If you wait too long to change a bad turbo, the turbine will eventually crash the housing and splode...

 

Hmmm.... A 420 code ya say there Genik? That tells me your car's been smok'n somethin funny! :sosp:

Or, maybe just the driver.

 

Play in the turbo shaft...

The fact that your car has already told you via check engine light...

If your not already certain just forget about it and wait for it to frag.

 

The turbocharger is easy to check. Take the turbocharger end of the rubber air intake hose loose from the turbocharger and grab the end of the compressor wheel, it should spin easily but you should not be able to move it in any other direction. If there is any other movement, in and out, up and down or side to side, then your turbocharger is bad and needs to be replaced.