Hey Guys I have a question about this error code P1121 - Accelerator Pedal Position Sensor Range/Performance Problem. I have done a search for this problem in the forums, but it seem like most people get P1121 and P1120. I went to AutoZone and I just have error code P1121.

In my case I have a 99 GS400 and every couple of days I start the car up and back out of the garage and put it in drive and I have no throttle response and I get the check engine and VSC lights and all. Then I just turn the car of and usually I will have the throttle response back and the car will drive fine. It’s happening more and more now and I don’t want to get stuck. Should I just replace the Pedal Position Sensor (the sensor which has the throttle cable connected to it)? Since the problem is intermitted when I test the sensor with an Ohm meter everything is ok, I have the factory workshop manuals that show you how to test them. The closest Lexus dealer is 100 miles from me or I would just bring it in.

Thanks,

Matt

 

Mine came up with the P1121 code aswell...had my local Toyota-dealer change the pedal linkage position thingy...and presto..no more troubles..for me that is

 

So was that the piece on the throttle body that the cable connects to?

 

As i understood it it was inside the car...on the pedal-linkage...BUT i might have misunderstood...so dont qoute me on that

 

Common area of concern with that motor is the Throttle Position Sensor and Throttle Pedal Position Sensor. My bet would be the later. $260 bucks from the dealer. Went through two in my GS4.

 

ive had this issue TWICE. since then, never again. I havent repaired anything. Seems like GS has all these issues. Kinda scary. Thank god i only have 40k miles.