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CAT bypass X-pipe O2?

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Old Jan 7, 2014 | 05:30 PM
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04CTT
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From: S.NH
Default CAT bypass X-pipe O2?

I took a quick look at the CATs on my '05 997.1 C2S and did not see any post CAT O2 sensors, are they just pre-CAT on the C2S? If no O2's == No CEL Thanks.
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Old Jan 7, 2014 | 09:23 PM
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All OBDII cars (1996 and after) have O2 sensors before and after the cats. They are both there ( 2 each per cat) - one is on top and the other is kinda on the end and behind.
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Old Jan 8, 2014 | 04:26 PM
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From: S.NH
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Thanks for the info JW, guess I'll need bypass pipes + softronic flash.
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