I’m having problems with my car, when I’m idle sometimes my rpm will go above 1, I had taken it to the shop spent 2000$ and still having the same problem! Idk what to do idk if I need a new ecu? I’ve watched videos on yt looking up what it could be and not sure what’s actually wrong I have the diagnosis reader the FIXD one and shows some codes and that’s what I’ve been looking up , if anyone can help me with what to do, I just got this Lexus back in March

 

I’d make sure the oxygen sensors are OE Denso part from the dealer, I’ve seen after market O2 Sensors cause this issue.
Have you done anything regarding the torque converter code?
And what all did you get fixed for $2k?

 

If you O2 Sensors have fluctuations in voltage, the ECM will compensate. That may be your problem. They (Bank 2) are a bit of a pain to change considering where the connector is, and they have to be installed from the bottom up for the rubber plug. But it's really a three on the difficultly scale out of ten.

Paul

 

here’s the invoice receipt he gave me. I was telling him what was wrong with car and stuff and how I’ve looked up different videos about the p1755 code but idk if he was really listening to me, I do have a 90 day warranty still, should I take it back to the mechanic?

 

Well. Everything I see is typical of a high mileage engine. But no mention of O2 sensors.

Paul

 

My GS400 was throwing bad 02 sensor codes, and other mayhem, and it turned out to be a combination of 1. A leak under the intake manifold (the plastic core in the steel-plastic-steel gasket was cracked), and 2. A failing fuel pump. I had already replaced both 02 sensors, which did nothing, since it was the intake leak that was causing the engine to run lean, which confused the 02 sensors.