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Mustang Forums
2012-2013 Boss 302 Mustang
Codes with kooks "green" cats?
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<blockquote data-quote="pufferfish" data-source="post: 13362524" data-attributes="member: 153725"><p>I ended up with kooks shorty headers and factory cats because of the CEL issue with longtubes and catted x. I don't believe there is any fix and kooks is going to throw in the towel. as someone mentioned, the oxygen sensors are very sensitive to additional airflow as well as heat differential. moving the cats back because of longtubes introduces a different heat differential and using high flow or "green" cats increases airflow. there is no solution until someone dares to crack the logic in the PCM to fool it into thinking the stock cats are there. simply turning off the rear oxygen sensors will eliminate the CEL, but will not allow the vehicle to pass emissions. the emissions test pulls a datalog of testing done by the oxygen sensors. if the rears are turned off, there is no test, so no datalogs, so no passing emissions.</p></blockquote><p></p>
[QUOTE="pufferfish, post: 13362524, member: 153725"] I ended up with kooks shorty headers and factory cats because of the CEL issue with longtubes and catted x. I don't believe there is any fix and kooks is going to throw in the towel. as someone mentioned, the oxygen sensors are very sensitive to additional airflow as well as heat differential. moving the cats back because of longtubes introduces a different heat differential and using high flow or "green" cats increases airflow. there is no solution until someone dares to crack the logic in the PCM to fool it into thinking the stock cats are there. simply turning off the rear oxygen sensors will eliminate the CEL, but will not allow the vehicle to pass emissions. the emissions test pulls a datalog of testing done by the oxygen sensors. if the rears are turned off, there is no test, so no datalogs, so no passing emissions. [/QUOTE]
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2012-2013 Boss 302 Mustang
Codes with kooks "green" cats?
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