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Old 09-18-2011, 11:00 PM   #1
02insecturbo
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Default Does a Catless down pipe need a 02 Sensor??

Hi I have a 2003 wrx with a perrin DWG cattless downpipe, Evo 2 catback, K&N typoon. I got it tunned with a Coob Accessport. My question is do i really need a 02 sensor on my DP? If my dp is catless. Will this ruin my car? Thanks
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Old 09-19-2011, 12:37 AM   #2
02insecturbo
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Bumppppp
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Old 09-19-2011, 08:52 AM   #3
rrob311
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I am not sure if the downstream o2 influences fuel trim at all on these but I have seen it do weird things on yotas. If you had it tuned I would imagine they know a way to eliminate the need for the downstream if the cat is gone. As long as the upstream is doing it's job I would think it would be ok.
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Old 09-19-2011, 10:25 AM   #4
eg33GC
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wrong section

remove the rear 02 from the ecu and you shall be fine. some argue it affects fuel trims, but it really just checks for voltage change compared to the front 02
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Old 09-20-2011, 10:08 PM   #5
02insecturbo
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Quote:
Originally Posted by eg33GC View Post
wrong section

remove the rear 02 from the ecu and you shall be fine. some argue it affects fuel trims, but it really just checks for voltage change compared to the front 02
Thanks
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