LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

P0505 Idle control malfunction

Old 05-10-19, 03:30 PM
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Join Date: Apr 2015
Location: Arizona
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Originally Posted by LexusNAZ View Post
I have a 2000 LS400 with the bouncing idle needle on start up with a small fluxuation then would go away. I ended up with VCS off and check engine light and the code P0505. I did a seafoam throttle body cleaning spray can kit and seafoam in the crank as well. The car has 199,500 miles it looked like the neighborhood was going up in smoke. I have had a few other weird codes so I may need to redo the ecu capacitors soon... Thanks for the thread hopefully this solves my P0505 problem.

I did a seafoam throttle body spray and the traditional seafoam and the car smoked a TON! I also changed the spark plugs and reset the ECU no more codes car drives great!
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