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Old 08-29-2012, 02:14 PM   #1
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Join Date: Sep 2011
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maxspeed check engine light fix

for those of us considering installing cat-less headers, has anyone tried the maxspeed mini cats? i will eventually have the ecm flashed, but until the intake side is done i'd like to be able to run w/o the cel from cat removal and i don't want to lengthen the o2 sensor wires to run further downstream. just looking to keep things running right w/o cel until bolt-ons are finished and then i'll have the ecm re-flashed.

btw i did try to search, but couldn't find anything. if there is another thread, kindly link to it. thanks.

brad
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Old 08-29-2012, 02:21 PM   #2
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try just zip-tying the o2 sensors in fresh air - makes the ecu think the cats are working really well.
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Old 08-29-2012, 03:50 PM   #3
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i may be wrong, but i think that will ruin an o2 sensor pretty quickly. i also thought they had to see some variance. regardless i am willing to spend the money on a patch so that i don't have to have the ecm reflashed twice; once after exhaust mods and again after intake mods. anyone else?
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Old 09-04-2012, 07:18 AM   #4
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Just so you know. The CEL that comes from not having a correct reading from the O2 sensors does not affect the engine's state of tune. Equally I do not believe it is possible to reflash the ECU to compensate for a lack of CATS.

Radium's solution may work on your car and I have seen it work on many but it does not work on mine so it may not work on yours. As far as I know there is no great risk to damaging the o2 sensor this way. When you think about it they usually reside in a pretty harsh environment.

In the case of my specBox I just let it run with the CEL on (from about 5 different sources) and only get concerned when it starts flashing.
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Old 09-04-2012, 07:26 AM   #5
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Just so you know. The CEL that comes from not having a correct reading from the O2 sensors does not affect the engine's state of tune. Equally I do not believe it is possible to reflash the ECU to compensate for a lack of CATS.

Radium's solution may work on your car and I have seen it work on many but it does not work on mine so it may not work on yours. As far as I know there is no great risk to damaging the o2 sensor this way. When you think about it they usually reside in a pretty harsh environment.

In the case of my specBox I just let it run with the CEL on (from about 5 different sources) and only get concerned when it starts flashing.
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