SOURCE: my 1991 lexus ls400
The most likely problem is your alternator, the alternator charges your battery while the engine is running, if the alternator is bad you have a dead battery, but you can check with a volt meter to ensure that is your problem. Start your car (use a battery charger or jump to start it if you need to) and put your meter on the battery post's. If your reading 13volts or so your alternator is working and maintaing voltage, however if your reading starts dropping to 10 or less(may take a few moments to drop) then it's probably your alternator. You can also check your battery's voltage before starting your vechile, if the voltage increases after you start the vechile then it seem to be charging. Alternators can be repalced somewhat easily, it's only two boltsm however you do have to remove the fan belt, and re-route after installing the new alternator. If you have some expirence working on cars you can do this yourself in your driveway.
Good luck
Here's a start for you, hope this helps
SOURCE: 92 lexus es300 knock sensor
Need to remove the upper and lower air intake manifold. There are two knock sensors for the front and rear pistons banks. If you plan to do this yourself it is about 1 to 2 hours. While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it. Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300. Pretty easy.
DIYr
SOURCE: Lexus ES300 1999 with an ignition key problem
your ignition switch is going bad. The pieces inside the ignition get worn out, eventually it will lock up and you will not be able to move the key.
SOURCE: Trunk Release Button on 1999 lexus es 300 doesn't work
If its lock it wont operate unless you unlock it. To do that you need the master key. The valet key wont unlock it.
SOURCE: How many O2 sensors on a 1997 Lexus ES 300?
according to the manual i have... it has three.... one in the exhaust manifold.... and two in the exhaust pipe..... slightly vauge on the exact location of the last two sensors... but looks like it is after the catylitic converter.
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Hi mlbscouting, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Have you checked the alternator? Voltage should be at least 14vdc with engine running.
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