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Audi guys connect a $1.30 diode to the secondary cats and it seems to get rid of the CEL. It drops the O2 voltage down to .45 and fools the computer into thinking the cats work (exist). I will try it on mine when I install the headers in a couple weeks. Lets see if I can dig-out a link.
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1983 928 S Euro- fun to work on
2002 Boxster- fun to work on, being able to drive it is a bonus
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