Thanks RX300Houston for your post, it was a great help. I also had Codes p1354, p0300, p0302, p0304, p0306, with rough idle and hard brake pedal. After reading your post, I removed the Bank 2 OCV, it looked clean. The coil resistance checked normal at about 7 ohms, and applying 12 volts to it caused it to operate. I reinstalled it, hoping it was just a dirty electrical connection which maybe now was corrected, but same problem. I removed the valve again and cleaned it with carb cleaner, reinstalled it and with engine running at fast idle, applied 12 volts directly to it on and off several dozen times. I could tell it was working, because the engine would change speed as I did so, and I was hoping this would flush any dirt or gunk from the valve and actuator. It actually got worse after that, and on the highway it seemed like half the cylinders were intermittently cutting out.
I removed both valves, hoping to swap them for troubleshooting, but they are not interchangeable. I took a wooden golf tee, and moved the spools on both valves back and forth, and guess what? The spool on the good side moved smooth as silk, but the bad side it was slightly sticky. So checking it with 12 volts is not a good test, because in operation the valve is modulating against the return spring by varying width pulses, and must move freely.
Anyway, I bought a new valve at the Lexus dealer and now my RX300 is back to it's old self. Hope this helps somebody.
:) :)
