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Old 03-12-2006, 03:36 PM
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Schnell5 Schnell5 is offline
Location: Salt Lake City, Utah
Join Date: May 2004
Posts: 141
Mein Auto: 2002 M5
Originally Posted by bchang2001
will aftermarket cats throw cel codes? im getting the code for cat converters but they were replaced about 2 months ago. thanks
Did you replace the 02 Sensors as well? Is this the first you are getting the CEL since you replaced the Cats?

The most important thing to aftermarket cats is having them placed exactly where the OEM cats were placed. This is so the pre and post 02 sensors get the proper reading.

The codes more than likely are saying that your post sensors are sensing that your cats are not working properly when there could be a strong possibility it is just a worn or old sensor that is not as sensitive as it should be.
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