I am sorry in advance for the crappy small pictures, as they are not my own. But this will tell you how to eliminate the CEL after installing a test pipe/gutting your cat.

What you need:
1 package of spark plug non-foulers. 18MM


So you have here your basic spark plug non-fouler, it is orignally used to recede your spark plugs out a bit so they dont foul from a rich condition



What you have to do is drill out the inside of the top part, so the o2 sensor can fit. ONLY DO THIS TO ONE OF THE NON-FOULERS
side by side comparison of drilled out nonfouler and original


02 sensor fit inside



Screw the two nonfoulers together with the undrilled one will have threads showing on the outside.
Then attach it to your post cat o2 sensor (you will have to remove it )



Then screw it back into the test pipe, reset your cel code, and drive away!




If you have problems , let me know.....

first class how 2 there mate

Is that on the rear O2 sensor that you need to do that on. The one furthest away from the cat?

EDIT: Very nice DIY

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Eli VandenBosch | VB Motorsport

JHM "solid" Short throw, Milltek, HID Kits, H&R, Bilstein, BBS, and many more!

Yes it is, dont do that to the primary one bad stuff could happen.

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monty just needs somebody with a vag to erase that nasty code for him.....anybody in the wisconsin / illinios area???

howbout that link to the vag owners.

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Fwd 99 ko3, apr 93 oct chip, hyperboost dv, cone filter, atp 3'test pipe, b&m sts, tein s-tech springs,bilstein shocks struts

aol sn - oneslowa4

or they can just buck up and by the vagcom

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'01 1.8T M FWD

18" Flik Wasp - Dieselgeek SS - APR snub

12" Kicker L5 Solobaric Sub - Forge DV

RS4 Grill - CC - 25% Tint - K&N Drop in

buck up and pay $300 just to clear a code?


I would think the justification in a vag-com comes not only from code reading/clearing but from logging blocks on your ECU.

at any rate.. why not spend the $5 and a few hours (could be less if you know what your doing) to do this? Then you dont have to putz around with the vag com in your car everytime to code comes back, and it will.

Disconnect your negative battery cable... that will clear it.. but make sure you have your radio code..