Check engine light came on????
08-30-2003, 08:00 AM
#1
Guest
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Check engine light came on????
i recently installed an indivia turbo back exhaust catless and the light did not come the first week and yesterday it came on i wonder if its because i have no cats and the o2 sensor just got smog out or somethig. is this normal to have check engine light on after u put a catless exhaust??
08-30-2003, 09:27 AM
#2
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Join Date: Nov 2002
Location: NYC
Posts: 1,646
Car Info: 02 WRX WRB
Yes. A catless exhaust removes the cat in the downpipe which is the primary catalyst and the one which the ECU monitors with the rear 02 sensor. The CEL may not come on right away, it depends on the type of driving you do since the ECU performs its catalyst efficiency tests during highway speed, steady throttle conditions. If you have a CEL now after installing a catless system it is most likely a P0420 catalyst inefficiency code although you should get it scanned to be sure it isn't something else.
You can get one of the MIL eliminators or fixes to "fool" the ECU and prevent the CEL.
You can get one of the MIL eliminators or fixes to "fool" the ECU and prevent the CEL.
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