You are in the same situation as I am. I have a obd1 b18c1 in my obd2 car, and the only code it throws running an obd2 p72 is 1137. I'm looking for some more info on adding the CKF sensor to a obd1 motor. Do you just need to change the oil pump to an obd2 version, or is there more to it that that? I always run a obd1 p72 ecu, I just need to run an obd2 system for emissions. CiViC2nR86: I have been looking at all the options for passing an obd1 motor in an obd2 car, and this looks like the only option is adding a CKF, unless you have a hook-up at the emissions place. You should already have all the rest of the obd2 emissions stuff because you car was originally obd2 anyway. You can't run an obd1 ecu becuase when they plug it in to the diagnostic port, it will not read. if you find another way to pass please let me know. BTW: great info form everyone elce, some of you guys really know your stuff.