I have problem on lexus es 300 99 year, when i driving at 70 miles my rpm is going to 4000. My overdrive it does not work. I have check engine light and its code is knock sensor bank 2.

Transmission not shifting into overdrive right.

If check engine light goes off then there is a trouble code stored. You'll need to retrieve the code w/ a scan tool and follow the proper diagnosis.

There would have to be some sort of control to engage overdrive. If it used to work and now doesn't suspect an open fuse or defective speed sensor.

the trans may not be shifting into overdrive.

You'll want to doublecheck & make sure the Overdrive is turned on. That's a high rpm for 55, even high I believe for Interstate cruising at 65-70.

Possibly get back to the dealer immediately if it's not the Overdrive switch.

There are issues with some models that concern the RPM staying around 4,000 even at idle & under the right circumstances, a transmission won't shift as it should based upon engine & driving signals that the Trans computer uses to determine when to shift.

Check your fluid first & remember, Overdrive doesn't work until the fluid reaches a certain temperature.

good luck

The only way to check why the check engine light is on is to have autozone or a mechanic put a scanner on the car and read the engine codes. This will tell you exactly what is wrong. Many part stores will test it for free. Mechanics will charge about $40 But you will definately know exactly what the problem is.

If gauge is fine and car smells hot. It is probably due to plugged exhaust unless you have a wire laying on the exhaust manifold and it's melting.

engine light keeps comeing on n sometimes the battery light comes on my 94 lexus es 300 wat does tat me

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,

i have a es300 95 check engine light on sometimes it blinks car putts in park,in drive,when ac on the putts worst

There is an overdrive fuse in the fuse compartment on the drivers side door panel, check and see if its blown, if it is there was some problems with the overdrive shift wire touches the bottom of the tranny pan, and can cause the fuse to blow out.