Question about 2001 Lexus RX 300

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High RPMs I have a 2001 Lexus RX300 and recently the car won't shift into overdrive. I am running at over 3500 RPM at 40 MPH. When I turn my car off and restart sometimes this will stop the problem. When the car seems to be running normally I'm at 2750 RPM @ 70 miles an hour. Is this normal or is this still too high to be running the car at. All of this started when I was coming off a long trip and my check engine light came on. I took it to a Lexus dealership and the code read knock sensor but I believe they are unrealated -Lexus wanted $1890.00 to replace left and right knock sensors) Didn't do it. My check engine light comes on and the high RPMs start up and the code reads Knock sensor. I have a friend that can read the code. Please help

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  • Anonymous Mar 05, 2009

    YES THEY ARE RELATED... CPU HOLDS OUT OVERDRIVE WHEN IT GETS A KS FAILURE. DEALERS SOMETIMES GET A TRANS REBUILD AND A SENSOR CHANGE SOAKING THE CUSTOMER.

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Yes its related to knock sensor because car is running rich in fuel, and car runs of on safe mode, so overdrive will be off. have you and a friend replace it. remove intake assembly, then intake manifold, but first remove your anifreeze from radiator, trust me you want to remove antifreeze! their are brackets by the fire wall to hold down the manifold, thats the hard part is taking it off and putting that on since not to much space to work on it. on the block you'll see the two knock sensors, has 2 wires each, knock sensors cost between 150- 200 a piece, still cheaper than dealership putting it on. also buy some liquid gasket because you will need that. after putting it all back together reset the ecu and you should be fine,

Posted on Jul 14, 2009

  • Lenny
    Lenny May 27, 2014

    Will this solve the problems with the code errors that i have provided? Is this not an electrical problem? How do i reset the ECU?

  • mcheesm May 27, 2014

    reset by obd2 diagnostics to clear code, after you replace the knock sensor.

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Make sure you are not activating the O/D switch in the shift stick inadvertently.

Look at the display panel, if the "Eng" light is on, you must get the code and repair the affected item. If you have knock sensors and/or oxygen sensors malfunctions that may prevent the transmission from shifting to O/D.

Check the ground cables located in the engine compartment, especially the ones behind the air intake manifold. If they are loose or broken it affects the ECU (car computer) and causes the transmission to work erratically. If they become disconnected it may burn the ECU and shut down the car.

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Always start from the least expensive and recheck the obvious. Good luck.

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