California accelerates alone ! IDLE AT 5000rpm

Hi !
My 2009 California has 21,000 miles.
I was in a parking and put N just before stopping my car, the idle went to 5000 rpm. I restarted the engine, the orange light appeared "AHV system failure, CST system failure and Manetinno failure, go to dealer" all together, it was driving very very slow (in a economic mode I guess). I started again the engine and idle was 5000 rpm again, I was able to drive the car to the garage, was driving at 42mph in 7 withouttouching the gas pedal. At stop lights, in 1, it was accelerating alone and was obliged to brake a little harder than usual.

What is your guess ?
Throttle sensor ?
O2 sensors?
Ratio air /gas sensor ?

The garage changed all fluids and spark plugs But the issue is still here.

A few months ago, we removed the valves to hear the nice sound every times and we changed the Evap leak Sensor (it had the Engine failure orange light sometimes before changing it).

Thanks have a good week-end!

 

Hi !
The garage is reputed in Florida and only works on prestige brands (PM for more info).
So the cleaned the throttle body and I used the car 4 times and the issue did not come back. He told me to come back in 500 miles to compare the spark plugs because it could be the O2 sensor too.

 

So you changed the full throttle body or there is a sensor next to it ?

 

My car was driving exactling as if you were pressing the gas pedal at 5% all the time. So the only way to avoid going to 5000rpm was to stay in 1 and brake in the same time. And it was forcing a little...

 

No, it does not shut it off in FIRST (or any gear), it was still accelerating a little, so the car was going to 5000rpm in 1, maybe 4500 in 2, 3000 in 3 that's why the car was still driving at 2000tr in 7 without touching the gas pedal.
No I didn't unplug the battery and went straight to the garage because I wanted to do the annual check up anyway.
I have seen this night that my OBD reader can read 3 different throttle % :
-pedal Gas throttle
-initial throttle sensor
-absolut throttle sensor
I will run some tests later that day (hot and cold and post it).

 

I did not explain correctly. When I go to a full stop, to avoid the car to go from 2 to 1, I usually put N when I am still at 15mph. I was doing that with a previous F430 and a previous Lamborghini Gallardo e-gear, but they were f1 gears, not dual clutch. Maybe it's useless to so that in a dual clutch? I was thinking it's better for the gearbox to stay in N when you wait 2min at a light... ?

 

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Since the mecanic guy cleaned the throttle body, 6 starts and the issue did not happen again. I am sure than living in Florida does not help for high humidity.

 

Yes I drive in manual most of the time, the speed selected is not always the "actual gear" I feel. Example : you drive 38mph in 2, you don't touch any pedal, you select 7 very fast (5 times push) and it will take 1sec or 1.5sec to actually select the 7, even in sport...

 

If the issue happens again, I will check on the obd if the sensor shows the good % throttle.
In order to know if the throttle body is defective or if the sensor of the throttle body is defective himself...
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