Audi A4 PO420 code

[Blaze1235]

Long time no post

and oh i'm back asking a question. :D

after some advice fir a friend. Engine management light came on giving PO420 code. says it's the Cat so they change the cat and sure enough the cats were all broken up.

They didn't change the sensors 3 Days later light back on. So then put a new Cat in new sensors and reset the parameters. (apparently).

3 days later light on again.

so my questions are.

Any ideas?
Anyone know a good Indy in South East London Kent area for Audi?

[Black Sabbath]

Not sure what to advise you tbh,I'm sure indy Audi dealers will be recommended to you very shortly.Where have you been again?I saw Nick back here recently

[Blaze1235]

yeah he is off to the ring this weekend

didn't invite me :(

[Blaze1235]

oh yeah and i been trying to save money not spend it mate hence i have avoided the forums:p