Question about 1999 Lexus RX 300
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Posted on Jan 02, 2017
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Aug 30, 2017 | Lexus Cars & Trucks
Mar 22, 2017 | 2000 Lexus RX 300
Jun 10, 2016 | Cars & Trucks
Feb 13, 2011 | 1999 Lexus RX 300
Start by checking the least expensive items:
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.
Now going to more profound mechanics, it could be a sticking shift solenoid valve, your RX300 transmission have five of those located were the transmission oil strainer (filter) is. It can also be an ECU malfunction and/or related to the wiring from the ECU to the transmission connectors.
Always start from the least expensive and recheck the obvious. Good luck.
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