99' A4 1.8T Catalytic Convertor Problem
My cat is bad on my car. I took it out and huge chunks of honeycomb are clogging it up. If I gut the convertor and put it back on will it set the Check Engine light. I know the downstream O2 sensor looks for the cat to do something and can sense it but will it notice thefree flowing cat and set the CEL?
Huck
Huck
If you do gut it, you need to install a pipe in the cat so you dont disrupt flow. Also you will get a incorrect flow cel from the o2 sensor after about 100miles or so
http://www.labreemotorsports.com/ got my freeflow for $200... very good substitue for very expensive cats. works just as good..
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