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Volkswagen Golf 2.0 AXW 2005 - Code P0420 #

Posted by Stephen Wright on November 25, 2014, 5:06 pm

Year of Manufacture *: 2005
Engine Size and Code *: 2000 AXW
( Optional ) Scanner Used: Snap on
( Optional) Fault Codes: P0420

Hello
We have had this car in with a P0420 code in was a little while ago checked out and put a new cat on , all was ok for a while then eml on again this time it was the Nox sensor changed and all ok. Now today customer has presented back with light on but car runs fine customer had said the car was just ticking over and it came on code p0420 stored. Has anyone had problems with these FSI engines.

Re: Volkswagen Golf P0420

Posted by Glen Strachan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat1463' width='330' height='300' border=0 style='border:none;'> on November 25, 2014, 5:12 pm, in reply to "Volkswagen Golf P0420"

Was it a genuine cat ?

Re: Volkswagen Golf P0420

Posted by Kevin Apps <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on November 25, 2014, 6:57 pm, in reply to "Re: Volkswagen Golf P0420"
Kevin Apps

Stephen

What RON does is say it sould be running on in the fuel filler ?

Kev.

Re: Volkswagen Golf P0420

Posted by Tony Bickers <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5143' width='330' height='300' border=0 style='border:none;'> on November 25, 2014, 8:05 pm, in reply to "Re: Volkswagen Golf P0420"
Anthony Bickers

This fault code is so well documented here, I will bet my back teeth this had an aftermarket cat fitted, the only aftermarket cat that I have found to work is from B and M, although the fit can sometimes need modifying, need Stephen to come back with a bit more information.

There was a thread on BBA forums a little while ago where it took 4 cats from 4 different aftermarket suppliers before one worked !

Re: Volkswagen Golf P0420

Posted by stephen Wright <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1023' width='330' height='300' border=0 style='border:none;'> on November 26, 2014, 9:00 am, in reply to "Re: Volkswagen Golf P0420"

Good morning thanks for the replies.
No it not genunie it was a B&M cat, i belive the fuel is a non supermarket unleaded, i have not looked at fuel filter Ron rating but will do later.
I have seen a lot of threads about P0420 all coming back to the cat, as a fault but was hoping sorry praying that it might be something different with the fsi, the cat is about a month old.

Re: Volkswagen Golf P0420

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on November 26, 2014, 9:50 am, in reply to "Re: Volkswagen Golf P0420"
Mark Carter

You will probably need a OE Cat but, ask yourself why the Cat was replaced in the first place.

What tests did you carry out before fitting the Cat?

Regards

Mark

Modern cars, Its all wizardry and witchcraft

Re: Volkswagen Golf P0420

Posted by Stephen Wright <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1023' width='330' height='300' border=0 style='border:none;'> on November 27, 2014, 8:42 am, in reply to "Re: Volkswagen Golf P0420"

Yes i was asking the same question, been through normal tests, live data on 2 scanners followed KTS for fault code.

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