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Old 11-25-2002, 05:51 PM   #1
RENEMARTIN
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Default CEI How to bypass it?

I Have all the cobb goodies and now my CEI is on. They told me it was the 2nd O2 sensor reading the same as the front one. And i know i have read a tread about something you can buy to hook up into something that will send a signal that will trick the ECU. Can anyone point me in the right direction on how to acquire one of these dodads? thanks RENE
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Old 11-25-2002, 07:03 PM   #2
jeffg
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Look in the vendor for sale forum, they have a thread there. I think they call them MIL Eliminators.

though, everytime I send them an email, I never get a reply.

Good luck.

J
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Old 11-25-2002, 07:42 PM   #3
Daveish
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Isn't there a line on the ECU wiring harness that triggers the relay to turn on the CEL? Maybe we could just cut that wire...

I don't have a wiring diagram handy, else I'd check. Anyone else?
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Old 11-25-2002, 07:57 PM   #4
Mulder
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Assuming you installed a catless exhaust, the CEL is a P0420 catalyst inefficiency code. The rear 02 sensor measures the exhaust after the cat and the ECU compares the readings to the front 02 to determine if the cat is working properly. When the cat is worn out and loses its effectiveness, or if it is removed, the ECU detects this through the rear 02 readings and sets the code.
There is no wire to cut to fix this, it is triggered internally by the ECU comparing the sensor readings. The MIL Eliminators and similar products work by modifying the rear 02 signal to make the ECU think the cat is still there.
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Old 11-26-2002, 12:50 AM   #5
EvasionOfTruth
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Old 11-26-2002, 02:35 AM   #6
Daveish
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Quote:
There is no wire to cut to fix this, it is triggered internally by the ECU comparing the sensor
I wasn't suggesting you cut O2 sensor wires. Besides, that would throw other CE codes...

When the ECU wants to throw a CEL for whatever reason, there has to be power sent from the ECU to the CEL to turn it on (or from the ECU to a relay to the CEL). The wire that the ECU powers to trigger a CEL was the one I was referring to.
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Old 11-26-2002, 03:37 AM   #7
RK Performance
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Just take apart the guage cluster and find the wire that powers the CEL illumination, then, cut it, no more CEL! Or even easier, you could just get some black electric tape and cover it!
I'm not helping am I?

Sorry!
-RYan
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Old 11-26-2002, 07:46 AM   #8
Mulder
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You do not want to permanently disable the light. There are many (hundreds) of failures that the ECU can detect that will trigger the light and you need to know about them. Most important of these is an active misfire, which causes the light to flash and can result in serious damage to the engine and/or cats (if you still have any) if you continue to drive in this condition.
Bottom line, there is no simple fix for this. If you want to modify your car in a way the ECU doesn't like you need to either accept the light being on (not a good idea either, because you won't be aware of other codes being set) or do the appropriate fix to eliminate that particular code. Also, in some states if your check engine light does not work you might not pass inspection.
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Old 11-26-2002, 10:06 AM   #9
RENEMARTIN
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I have the high flow cat that comes w/ the cobb exhaust system.
but i guess the cat may not be working, or just not very well. and it's brand new
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Old 11-26-2002, 10:32 AM   #10
EvasionOfTruth
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More than likely the cat is working just fine. Your ecu is not used to the high flow cat so it is triggering the cel. You gotta remember you had two stock cats to begin with and one cat now to do both jobs, so the rear 02 sensor is going to be getting different readings from stock trim. The above link that I posted will cure this cel issue.

B
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