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hey hey hey, So i got a test pipe. Put in non foulers and there still is a check engine light.

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Old 03-10-2008, 05:29 PM
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Default hey hey hey, So i got a test pipe. Put in non foulers and there still is a check engine light.
Any ideas? i had to drill out the non fouler a little to make the sensor fit. Should i add another one?
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Old 03-10-2008, 05:38 PM
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you are suppose to drill the hole of one... and stock a non cut one
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Old 03-10-2008, 05:40 PM
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Just to make sure...you only put non foulers on the rear O2, right?
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Old 03-10-2008, 05:42 PM
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play around with the non foulers a bit. aeb should work with non foulers
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Old 03-10-2008, 06:41 PM
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Default Correct....it's what I'm using, with no issues. Drill one, insert into another then -->
insert the sensor into the first one you drilled.
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Old 03-10-2008, 06:45 PM
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ok so i should get another one thats not drilled? i have just one on each and there both drilled.
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Old 03-10-2008, 06:45 PM
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um..... maybe
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Old 03-10-2008, 06:48 PM
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depending on how bad/good you drilled them you be able to restrict by using washers
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Old 03-10-2008, 07:02 PM
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Default you don't put them on the front O2. the point is to pull the rear sensor out of the stream
enough that it gets a different/lower reading that the front one. thus, the ECU thinks the cat is working correctly, and the front gets the reading that it wants/needs.

try just 1, then 2 ...on the rear sensor only.

on my first APR S3 cat:
<img src="http://pictureposter.audiworld.com/10901/02_spark_plug_non_foulers.jpg">
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Old 03-11-2008, 05:54 AM
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well there you go.
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