1999 ES 300 Lexus check engine light on and Over drive Off

30

Asked by Sep 19, 2015 at 02:21 PM about the 1999 Lexus ES 300 FWD

Question type: Maintenance & Repair

I have a 1999 lexus es300 160,000 miles with check engine and Over
drive Off light on. When I drive on the highway drives at 4,000 RPM  instead
of the usual 2,000.

6 Answers

72,405

Sounds like it's not upshifting into overdrive and the torque converter clutch in the transmission isn't locking in. HTH. -Jim

30

Last month I changed all spark plugs and two ignition coils and after few days both The lights for Trac Off & Check engine light, are on. if I clear it by disconnecting battery its back after few miles driving and When I drive on the highway RPM is more than 4000. The code is for knock sensor, and according to mechanic the high RPM is not due to knock sensor, its some other electric problem. Two transmission specialist also checked it and both said transmission is working fine.

1 of 1 people found this helpful.
72,405

Your mechanic is correct about the knock sensor being unrelated to the high RPMs. Have you been able to get the trouble code for the Traction Control System? That could be related to the high RPMs. Perhaps you have a faulty speed sensor at one of the wheels. Is the speedometer working? This could very well be a sensor problem causing the transmission not to shift. HTH. -Jim

95

Just went thru the same thing, with the same Lexus. Changed the temp control sensor, Easy to do. Computer is getting a false reading as to what the temp of the engine is causing not to shift until completely warmed up. Knock sensor are an expensive fix if it's that problem...

3 of 3 people found this helpful.
30

The speedometer is working, don't have the code but will get it scan and get the code, but I remember he said the code is for knock sensor which he cleared, but after few miles the Trac Off & Check engine lights are back. As suggested will try to change the temp control sensor, hope it will also work for me.

30

Thanks for the answer, just one question before I change Temp sensor, in your case what was the reading of temp gauge, in my case the temperature gauge is always below the half mark, you still think I should put a new one.

2 of 2 people found this helpful.

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