Lexus Troubleshooting Questions? Ask a Lexus Expert
Ok I've done the test. I tested the control valve first by disconnecting the connector and applying 12 volts to the valve. When I did the engine began to run very rough; when I removed the 12 volts the engine returned to a nice even idle.
Second test: I cleared all the codes and let the engine idle at least 15 minutes; no codes returned. I then reveved the engine to 2500 rpms for about 5 minutes: no codes came up. The engine runs perfect. I remember the last time I cleared the codes we had to drive about 5 miles before they returned. Do you have any more ideas or test?
The code number I am receiving, among others, is P0135 - Sensor Heater Circuit Malfunction Bank 1, Sensor 1. I replaced both O2 sensors and put my notebook on it and the fuel ratio is excellent. The O2 sensors are working good.
My wife and I used the car this afternoon and it run perfect for about 30 minutes. We drove in the drive way and it started misfiring. It is as bad as when I test the OCV valve and put the 12v on the circuit. I turned the car off and restarted it and the motor misfired for about 15 seconds and then reveved up and then run fine. Can the OCV valve stick?