Re: ODB II Code P0135, what else can I try?
1. Verify that there is battery voltage when the engine is running to the White wire on the harness side of the air/fuel ratio sensor. If there is good voltage there, then the air/fuel ratio sensor relay and fuses are OK.
2. Next test the heater circuit of the A/F sensor, most A/F sensors have between 0.8 and 4 ohms of resistance, it is always good to check the heater resistance to see if it is open or out of specification. If the heater is open or out of specifications, replace the A/F sensor.
3. If the A/F sensor resistance checks OK, then verify that the Black/White wire back to terminal A10 of the ECM is not open or shorted. Always verify that the connections at the ECM are clean and tight.
87 crx si....all stock dd machine