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there are 2 O2's .. the primary one which before the Catalytic and the secondary one after the catalytic .. the primary one is responsible for the fuel mixture ..
the secondary one is to make sure the catalytic is doing it's job ...
the primary one can't be removed ... but the secondary ones can be replaced by the o2 sim + some resistors for complete ... but i have no idea about the 02 sim which is built in in the procede ..so Shiv should give u some info ..
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