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Discussion Starter #1
just to double check there are two sensers on the cat the top on is a air to fuel senser and the bottom one is for the O2 senser???
 

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Discussion Starter #4
so both of the sensers on the cat can set off the check engine light or only the bottom one??
 

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The bottom one will because it normally has a cat above it the top one won't with a race header because it doesn't have anything above it. As far as with stock parts if either sensor goes bad they will throw a light.
 
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