New to this entire scene including Honda itself, bought my first car recently, 1990 CRX HF, previous owner swapped in a D16Z6 (non-vtec). I read up on the engine and it says it's meant for OBD1, but my CRX has an OBD0 ECU (PR3 to be exact). I kept reading mixed results on the subject of D16Z6s working with OBD0 ECUs, some say it won't work, some say it does. Then the ones who say it won't work with the OBD0 PR3, but there is an OBD1 PR3 as well that should work with. I'd like to get a final answer. The ECU itself, I'm not even sure if it's managing my engine properly, since it's telling me my O2 sensor is malfunctioning. But I don't have any spare sensors to try and test it either. So whether or not it's the OBD0 harness/ECU is up in the air for right now. I want to upgrade to OBD1 regardless though, since it's what my engine was made for, and wanted to know if pulling the harness out of some other OBD1 car would work or if it's model specific wiring? Would any OBD1 ECU work as well or should I start hunting down a P28? How do I check the distributor to make sure it's not an OBD0 model swapped on? Thanks. //I meant to post this in the Hybrid board, oops! If possible could a mod move this?