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Old 04-12-2004, 04:08 PM   #1
ammoniaman
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Default is there a way to trick the ECU into thinking your o2 sensors are hooked up??

I live in PA we just started emissions testing. the test involves hooking up to your ecu and testing to see that all your sensors work and that your EGR stuff is working. Well my problem is I have no stock cats. The one in the up-pipe is gone and the probe that was in it has been removed and a resistor has been installed in the plug so the ecu "thinks" there is a probe installed and is working just fine. my problem now is the other o2 sensor. i have a MRT D-pipe with a high-flow cat replacing the other two. The o2 sensor is plugged into that. I have a CEL that said that my cat is not doing its job. The o2 sensor is not bad but I guess it can tell that the cat is not working right?? So is there any way to to fake the ECU out preferably without removing the o2 sensor (air/fuel readings). I also have a Utec installed... could it be used to my advantage in this situation? am I up a creek without a paddle or can something be done? All ideas welcome thanks everyone!
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Old 04-12-2004, 04:43 PM   #2
Nick M
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you can do the mechanical fix for the rear o2 to allow it to read cooler exhaust temps and think your cat is working fine
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Old 04-12-2004, 07:50 PM   #3
AK_2002_WRX
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you would still fail IM with the rear 02 sensor fix. it will show up as Rear 02 sensor not ready, or something of that nature on the I/M Computer.
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Old 04-12-2004, 07:59 PM   #4
ride5000
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Quote:
Originally posted by Nick M
you can do the mechanical fix for the rear o2 to allow it to read cooler exhaust temps and think your cat is working fine
fyi, not so much cooler exhaust temps, but more slowly changing exhaust o2 concentration levels.

ken
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Old 04-13-2004, 12:57 AM   #5
Mr. Fancypants
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Quote:
Originally posted by AK_2002_WRX
you would still fail IM with the rear 02 sensor fix. it will show up as Rear 02 sensor not ready, or something of that nature on the I/M Computer.
I believe the "not ready" status is related to electronic fixes (i.e. Pony Express). The mechanical fix is the way to go.. they sell em at Flat4Engineering but you could probably go to a hardware store and do it yourself.
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Old 04-13-2004, 01:07 AM   #6
InfamousDX
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Quote:
Originally posted by Mr. Fancypants
I believe the "not ready" status is related to electronic fixes (i.e. Pony Express). The mechanical fix is the way to go.. they sell em at Flat4Engineering but you could probably go to a hardware store and do it yourself.
I'm thinking the same thing. And I think the mech. fix is great.
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Old 04-13-2004, 01:26 AM   #7
mexicanpizza
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Quote:
Originally posted by Mr. Fancypants
I believe the "not ready" status is related to electronic fixes (i.e. Pony Express). The mechanical fix is the way to go.. they sell em at Flat4Engineering but you could probably go to a hardware store and do it yourself.
Has this been confirmed? (The "not ready" status with PE fixes)
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Old 04-13-2004, 02:12 AM   #8
Mr. Fancypants
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Quote:
Originally posted by mexicanpizza
Has this been confirmed? (The "not ready" status with PE fixes)
Im not sure if any of this has been confirmed. I recall reading a thread in which someone with a electronic CEL fix didnt pass because his rear 02 was "not ready." I tried searching but cannot find the thread (not even sure it was this site, perhaps it was a dream)

Contrarily, in this THREAD , Ken (ride5000) says that you can still pass emissions with the mil fix and that it will NOT prevent the ready flag from being set.

I am not familiar with the PE fix (is this the same as the Pony Express with the resistor?)
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Old 04-13-2004, 02:25 AM   #9
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These are the inspections where they plug into your OBD2 plug?
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Old 04-13-2004, 06:14 AM   #10
file_id
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You will pass with the Poney Express Eliminator. I have the PEP in my downpipe and already did the research to make sure that it will pass. Otherwise i would have gone with the mechanical fix. Mechanical fix does not work on some cars.

Quote:
by including the electronic filter, the ECU will receive a signal from the rear o2s that looks exactly as it should. therefore there is nothing to prevent it from flagging the test as "passed" (other than insufficient driving following an ECU reset, which is always true).
Here is more information on why it will pass

http://ken-gilbert.com/wrx/obd2/Image-12.JPG
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Old 04-13-2004, 07:39 AM   #11
Karl
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If you have an OBDII scanner that reads readiness status, you can find out for yourself whether they are done or not before you take your car in for inspection.
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Old 04-13-2004, 10:40 AM   #12
ride5000
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my friend, who works at a garage which does inspections, has verified for me that my 03 with a resistor/capacitor do it yourself electronic fix does NOT prevent the ready indication from being registered. he told me that he would pass my car from what he was being informed via his snap-on obd2 scanner.

i know that the 04s are a bit more fussy when it comes to plain jane low pass filters, throwing a different CEL for slow response. some folks have been successfully keeping BOTH CELs off by just using the series resistor, and not using the shunt cap.

hth
ken
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Old 04-13-2004, 09:39 PM   #13
ammoniaman
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THANKS guys, I'm sure its old news to all you. Your info is a big help!!
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Old 04-14-2004, 12:16 AM   #14
AK_2002_WRX
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would it be the same with a Helix CEL fix? i think its about the same as the PEP.
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