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Hey everyone.

I know there are multiple threads out there for this issue, but I have not found a solution that has helped... :mad::horse::bash::bash::bash:

I don't mean to create a dead thread, but here is the story with hopes someone will have additional insight.

I bought the car with a known emissions CEL.
I have replaced: the thermostat, the Cat x2, the O2 sensors.
I have a VAG-COM and can see what codes it is throwing (P0420) and its readiness.
I have done the SeaFoam trick.
It has a new air filter.
I have cleaned the MAF sensor.
I have tried new plugs (E3 diamond fire).

What else can I try or do? I would like to get this car on the road so it can start earning its keep!

Again, my apologies for a new thread; I didn't want to hi-jack someone else's...

HELP!!!:runnethov
 

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wow

Well you did everything I know to try and fix that problem.
Mine got fixed by using the seafoam cleaning, I must have been the lucky one. Next stop for you might be a pro. Mechanic.
 

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Please post your full VCDS scan; do you have a full version from Ross Tech? If you do; you can get help, from the Ross Tech support forums. They have been very response in my experience and helped me out there with any questions I had. Even, the founder of the company Uwe Ross; helped me and was able to resolved my problem. That is impressive and made my purchase price; worth every penny, I paid.

http://wiki.ross-tech.com/wiki/index.php/16804/P0420/001056

I have heard negative reviews about the E3 plugs; many times, they cause problems. I would stick with the oem NGK plugs; look up the correct ones for your car here: https://www.ngksparkplugs.com/

Seeing how you have VCDS; you could check live data and see what is going on.

These would be good areas to check: (once you do those tests; post the results)

http://forums.vwvortex.com/showthread.php?1265064
 
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