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Old 06-21-2004, 10:13 PM   #1
blackbeast23
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Question Oxygen Sensors

I am in the process of turboing my 99' RS. Here is some background info... Before the turbo, I had the COBB Tuning Exhaust and Midpipe, with the Random Tech Hi-Flow Cat and Borla Headers. The Random Tech Cat had spots for both O2 sensors... one before the cat and one after. I also have the Pony Express check engine light eliminator.

While doing my turbo install, I noticed that my downpipe only has a spot for one O2 sensor. The downpipe connects to another pipe which then connects to my COBB midpipe. This pipe between my downpipe and the midpipe has no bung for another O2 sensor. Can anyone give me some suggestions as to what I should do? Is it alright to not connect the second O2 sensor?
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Last edited by blackbeast23; 06-21-2004 at 10:23 PM.
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Old 06-21-2004, 10:40 PM   #2
munkis
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you dont need the second 02 sensor, just keep the pony express in there though.

are you running catless with the turbo?

Jay
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Old 06-21-2004, 10:45 PM   #3
blackbeast23
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Yeah, I'll be running catless.

Thanks for your help!
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Old 06-21-2004, 11:59 PM   #4
lotusTT
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the pony express will do you no good without a functional rear O2 sensor. It won't affect performance at all, but you will get a CEL if the sensor isn't connected.
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Old 06-23-2004, 01:53 AM   #5
no-coast-punk
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If you get a cat in-efficiency code due to the rear sensor being out, the ECU can lean out the mix under certain conditions to try and get the cat that it thinks is there re-lit. Something to be aware of.
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Old 06-23-2004, 08:53 AM   #6
Aphex
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could always get an O2 bung and get it welded in. under 20 bucks total probably.
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Old 06-23-2004, 03:28 PM   #7
blackbeast23
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Quote:
Originally posted by Aphex
could always get an O2 bung and get it welded in. under 20 bucks total probably.
That's what I'm having done today. I figure I should just do it the right way so I won't have to go back and fix something.
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