Hi everyone,
I want 1st to thank this article. It give me some idea of how to replace both knock sensors. It did take me about 8 hr to perform this task. It was also helpful to replace the spark plugs at the sametime (if has high mileages).
This is my story on 00 RX 300, FWD with 69000 miles: I have code P0330 and P0171 codes on. I was not able to get into over drive on my tranny. Took my car into 3 shops and all indicasted needed tranny overhaul, eventhough there were no tranny codes from the CEL. After did few researches, I came acorss w/ an artical that fited my problem and decided to tackled these knock sensors first. I did the work last Monday and the tranny is working fine SO FAR. The P0330 code was gone. Last nite, I removed and cleaned the mass flow sensor and now do not have this P0171 code anymore (knock on the woods so far). Hopfully, someone will do more research, and eliminate the codes 1 by 1, before replace/repair the tranny. It sure saved me approx. $4500.00.
One thing that I would add is that the by-pass hose: it does not have to be removed to replace the sensors, just have to move it side by side to get to the sensors. I was able to remove it w/o damaging it.
The common socket sizes are 10mm, 12mm and 14 mm and a 1 1/1" wrench (to remove the sensors - they were not very tight so they were very easily removed w/o breaking any knockles). One more item to remember, you only have to remove a single bolt, on both the air intake chamber bracket and the other bracket - only at the engine block, then the air intake chamber/throttle body can be lifted up and out at an angle. THis will save you alot of headaches as other two bots are in very tight spots and almost impossible to get the tool on them. If possible, purchase a service manual or get a copy of the air chamber/intake manifold instruction. It was a big help.
Good luck if anyone is trying to work on it themselves.
