The throttle valve stop in older Prius2 can be adjusted beyond 100000km. Cause of slightly increased idle speed due to increased leakage air via the throttle valve shaft. Remove air filter box. Unlock throttle valve stop magnifying screw 8er nut, turn out until throttle valve closes tightly. Plug air filter box roughly on. Drive system up to parking, press gas briefly until engine starts and wait until it runs out again. Appears error throttle valve hangs, delete error memory e.g. with AUTO Dia SX40. Not without diagnostic device perfekt, because engine sets itself on dead, and calls after the workshop. Stepwise magnifying screw 1/2 to 3/4 revolution turn in and repeat until error no longer appears. Thus, the engine is set up at every take away from the gas below 65km/h again. Stop the throttle valve is set at me to approx. 750U/min, in order to switch off again under 990U/min, over again the engine runs empty. Diagnosis device the first time, if throttle flap is set as an enormous number of light.