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-   -   Code #P0421. Please help. (https://www.audiforums.com/forum/b6-models-70/code-p0421-please-help-143390/)

hauptjr 03-13-2010 12:49 AM


Originally Posted by john@astigracing.com (Post 1183589)
Sorry for the late reply guys.

The code IS BACK. I'll try to check the vacuum lines behind each head for the Kombi Valves, and if that doesn't work, I'll check the wastegate.
Jim-- Do you think you can point out to me where this wastegate is located?

Appreciate it!

any luck yet? Is the CEL still coming on? Is it still throwing a p0420?
thanks!

stllplyswcars 03-29-2011 12:08 PM

Same issue
 
Has there been any progress regarding this issue. I have the same thing going on with my 02 A4 3.0, and poking around the engine compartment looking for a vacuum leak I found a really loose hoseclamp, I tightened it and I cleared the code with my scanner so we will see if it comes back. i would hate to spend any money if it could be a split or torn vacuum line.

Theugly02 04-07-2011 10:44 AM

Is there an aftermarket catalytic converter that is cheaper than the oem Audi ?

cwilson 01-12-2014 04:54 PM

I know this is an old thread but I am having this same issue with my 02 a4 3.0 quattro (97000 miles). I'm looking for some insight as to how you made out with this code

cwilson 01-14-2014 09:10 AM

Anyone?


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