Problem: Engine service light. 1988 Integra
I recently replaced two bent valves and the timing belt. Everything works fine, except the service light comes on. The ECU blinks 9 times, which indicates the cylinder position sensor. However, I tried another sensor (used) and got the same signal. So I ordered another ECU from a junk yard, and I still get nine blinks. I have checked the wiring to the ECU, the sensor plug, the coil resistance. The engine works fine, but can't get a smog check with the light on. What else could it be??

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