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Discussion Starter · #1 · (Edited)
I posted something along these lines in the performance area of the boards some weeks ago... Figure I might post it here as it would be better off here to begin with...

As far as I can see it... You can't use any mods that will trip the 'CHECK ENGINE' light without using a UTEC, XEDE, or any other kind of chip. I highly doubt the Prodrive Reflash will pass either.
Gutting the stock uppipe doesn't seem like an option now, unless, the sensor you can buy to prevent it from coming up won't be noticed by the OBD testing.

However, I do see this as possible...
If you do change the uppipe all all, have the fix for the CE light, and so on... And have the hardware to wipe the old data from the WRXs computer. You could essentually wipe out the old data, and when they plug in and to a check... "OK, you're all set. Have a nice day." However, that's considering the OBD scanning they do, doesn't notice some things are different, even though the CE light doesn't go on.

I'm guessing an OBDII hookup, and some general knowledge (or even a particular manual) of this would help.

Any thoughts?

~ Dan (Zapix)


Notice to All Motor Vehicle Owners
Important Changes to Connecticut’s Motor Vehicle
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Major changes in motor vehicle emissions testing affect Connecticut vehicle owners as of June 28, 2002. Below is an explanation of those changes.

1. Temporary Rescheduling of Emissions Testing.
As a result of the implementation of changes to the emissions testing program, there will be no emissions testing for a period of time beginning June 28, 2002.

DMV will reschedule emissions tests for all vehicles required to be tested at any time from July 1 through the early spring of 2003. Your current due date for testing is indicated on your vehicle’s emission sticker located on your windshield. Please take a moment to check this date. Only test dates between July 1, 2002, and March 1, 2003, are expected to be affected. If your vehicle’s test is rescheduled, you will receive a notice later this year from DMV that will give you a new emissions test date and the locations of the new emissions testing sites. The fee for the emissions inspection test will not change ($20 for a sticker for two years and $10 for a sticker for one year) when the new emissions program commences in the spring of 2003.

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30 Posts
They are essentially reading the the IM240 monitors with OBDII. IM240 is a couple of laws passed a while back with OBDii that says your car has to have the ability to monitor itself reguarding emmissions(mostly) and performance.
When the inspector checks these monitors he can see if the car has done its self checks on things such as misfires, heated cats, cats, A.I.R., EVAP Emissionions, EGR, and other stuff. The inspector can also see if the computer is commanding the CEL on.
In Maine if the (1.)self monitors haven't run(ie; battery recently unplugged) that is reason for inspection failure. other reasons for OBDII inspection failure...
2. If scan tool cant communicate with car.
3. If CEL is commanded on but light is not on.
4. CEL is on and commanded on by PCM only when being inspected. (In other words it could have recent codes but if those codes aren't commanding a CEL at the time of inspection then it is not reason for inspection failure).
Most guys just look for a CEL and don't bother to inspect it with the scan tool even though they are supposed to. If you don't have a CEL then you have passed the OBDII part of inspection. I have inspected one car with a chip and other turbo goodies. It was an Audi A4 with a chip and the scan tool wouldn't communicate with it.
The other thing is that most of the monitors don't run right away. Some take several ignition cycles or certain run time perameters, so essentially brand new cars don't pass OBDII inspection and by law shouldn't get a sticker, until the dealers get upset and they make a special excemption for them.
So, get your inspection before you do any modifications:D Or get yourself a buddy in the inspection ring.;)

2 Posts
Zapix said:

Gutting the stock uppipe doesn't seem like an option now, unless, the sensor you can buy to prevent it from coming up won't be noticed by the OBD testing.
I've not heard of anyone getting CEL's from just removing the pre cat. I do get a CEL every few weeks now that I've replaced the uppipe, downpipe and the third cat is now a TXS high flow, but even that should pass inspection with a MIL eliminator wired into the rear O2 sensor. Will a garage see that? Unlikely.

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