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Could be wrong, but I dont think its possible on a B18C engine, on a B16A2 (OBD1) u can go backwards cuz theres an OBD0 version of a B16 (B16A1), but the B18C dosnt have a version to go back too... I *think* u can make it OBD1 which is easier than switching to OBD2... But its still no walk in the park...
Just convert back to OBD-0 and switch everything to cable....I think that would be alot easier if I am not mistaken. Someone correct me if I am wrong!!
Chris C.
If he has to pass smog, any referee is gonna fail him as soon as he sees an obd0 ECU running an obdII engine.