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I did some trickery on an o2 sensor to fool the ecu into thinking there was a catalytic converter when there wasn't in order to keep the CEL off by soldering in some resistors inline with the return wire.. It worked for awhile, but was unreliable. I'm sure something like that (stand alone ecu w/ obd to pass an emissions test) would be possible with the right amount of knowledge and expertise. Something tells me that since its only purpose is to bypass state law is the reason such a thing does not already exist.
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