wont go over twenty miles per hour

Asked by Jan 17, 2016 at 01:15 AM about the 1999 Lexus ES 300 Base

Question type: Maintenance & Repair

4 Answers

109,615

Sounds as if you car is in limp mode, this happens allot when your car overheats , if thats the case you need to have the ECM reset...

6 of 6 people found this helpful.
73,775

Also have the catalytic converter checked, may be plugged.

4 of 4 people found this helpful.
125

This is the same problem I had. It is probablly in, "limp home mode." The car will automatically do this to protect the engine from damaging itself. In my case, the problem was a faulty knock sensor. Knock sensors are used by the engine to adjust the timing. If one is bad, it will not be able to adjust the timing correctly and it will automatically go into, "limp home mode." I have also seen this happen when the timing belt is bad and it is slipping. You should not drive the car at all! You should have a service engine light on. Get the codes read to pin point what exactly is going on. My code told me it was the knock sensor. After the sensor was replaced the problem was gone.

125

If it is your knock sensor, the stealership will charge you an arm and a leg to fix it. Check out this video where I show how to change them. It may save you hundreds. http://youtu.be/BhSTe75nP7E

2 of 2 people found this helpful.

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