Removing oxygen sensor
Race Director
Joined: Oct 2008
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From: Lansing MI
The purpose of the o2 behind the catalytic convertor is to monitor the performance of the catalytic convertor. So removing it shouldn't change the performance of the rest of the car, but you can be sure that the check engine light will eventually come on. So for that reason, I would not do it.
Le Mans Master
Joined: May 2000
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From: Redmond WA
It is used for monitoring the efficiency of the cat. It will set a code if missing at a minimum, but I can't THINK of any way in which it should affect performance unless perhaps it is also used for cat overtemp prediction or prevention or mitigation.
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Cruising
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Le Mans Master
Joined: Oct 2014
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From: Atlanta GA
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Cruising
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Melting Slicks
Joined: Aug 2014
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There is an oxygen sensor before and after each cat. The sensors after the cats can be removed without impacting engine performance and would be part of the cat back system. The oxygen sensors before the cats are the ones that can impact engine performance, but those would not be removed for a cat back swap.
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Le Mans Master
Joined: Oct 2014
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From: Atlanta GA
Also if you are installing a Corsa or a Borla Cat less X pipe there is no need to remove sensors as they only monitor the efficiency of the front cats , the rear PUP cats in the X pipe are not monitored
The only time the rear sensors are removed sometimes is if you are installing headers at this point you would tune out the rear sensors as they are only there to monitor CAT efficiency
You should never remove the front O2 sensors there are only a few examples of why you would and I am confident you do not need to do this ….……
Dave
Le Mans Master
Joined: Oct 2014
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From: Atlanta GA
There is an oxygen sensor before and after each cat. The sensors after the cats can be removed without impacting engine performance and would be part of the cat back system. The oxygen sensors before the cats are the ones that can impact engine performance, but those would not be removed for a cat back swap.
Dave
Melting Slicks
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On edit: Oh I see what you're saying...I said that they were part of the cat back which is incorrect...hopefully OP or their mechanic will figure that out if/when they start taking it apart.
Last edited by lakemg; Dec 9, 2018 at 03:54 PM.
Le Mans Master
Joined: Oct 2014
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From: Atlanta GA
That's correct...no need to remove them but OP asked about removing them either thinking that there was a need to or wasn't sure.
On edit: Oh I see what you're saying...I said that they were part of the cat back which is incorrect...hopefully OP or their mechanic will figure that out if/when they start taking it apart.
On edit: Oh I see what you're saying...I said that they were part of the cat back which is incorrect...hopefully OP or their mechanic will figure that out if/when they start taking it apart.
Dave
Last edited by Dcasole; Dec 9, 2018 at 03:59 PM.