I have a 2007 IS250 AWD. For the past year or so I have had an occasional problem with the transmission surging and sticking at about 4000 rpm's even though I am not accelerating. I have reported it to the dealer a couple of times and they can't replicate it and say they have not heard of this problem. The told me to use premium gas and that should resolve it. I have done that for the past year and it's only getting worse. It is happening every time I drive now. At low speeds and at higher speeds. When it does it I press firmly on the gas and release and eventually the RPM's will go back down to normal. Any ideas?

 

disconnect the battery let the ecu reset...

 

Thank you. I will try that and report back

 

are you back yet how is your Transmission now ? lol

 

I have an appointment with the Lexus Factory Service Rep on 7/8 so we will see what he says.

 

Look like bad transmission sensor you might need new transmission.