Check Engine Cuz Of De Cat?

[kbh]

i'm just wondering if removing the cats of our cars will trigger the check engine?

my tuner told me that the check engine is there because the o2 sensor senses something wrong with my cat which isnt there..

i had this problem after making a custom headers for my car without cat. very noticable gains in the dyno but the check engine keeps on showing up even if its been reset in the OBD scanner.. you guys had this problem too?

here the pic of my engine bay:

http://community.webshots.com/scripts/edit...security=jOGBcM

http://community.webshots.com/scripts/edit...security=IrzmlA

thanks guys

[Monster-Mat]

have you removed the main cat..if so thats the problem

[AltezzaScott]

Might have to buy an o2 simulator

[kbh]

i did...

removed everything...

so whats the solution? dont want to weld back my cat...

whats an o2 simulator?

[tdiplc]

whats an o2 simulator?

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It's an electronic unit the simulates an 02 signal

[Monster-Mat]

Mark is right, but personally, i would consider re-installing the cat, or at least getting an aftermarket alternative (weld in replacement)

[kbh]

where can i buy that o2 simulator?

[Lexus Jim]

Mark is right, but personally, i would consider re-installing the cat, or at least getting an aftermarket alternative (weld in replacement)

←

out of intrest, why?

[ColinBarber]

where can i buy that o2 simulator?

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search on google for o2 simulator there are lots about. Probably have to get one from the US.

You either need a proper 4 wire simulator or just a 2 wire simulator and keep the other 2 wires connected to the heater on the existing O2 sensor otherwise you will get a CEL as the ECU can detect a failed heater circuit as well as incorrect readings coming from the sensor.