Alright I am puzzled. I have a 88' honda civic with a 91' integra motor in it. I have a pr4 ecu with a mugen chip in it. When I put in the factory chip it throws code 1 which is the oxygen sensor and with the mugen chip in it throws code 10 which is air intake temp. I have swaped both the oxygen sensor and the air intake temp sensor out and it is still throwing the code. Me and two of my friends did the wiring on the car to change it from dual point injection to obd-0 but I am almost positive that all of the wiring is correct. Can some one please give me some ideas on what to check for.