Question about Mercedes-Benz CLK-Class

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Car stalls at idle. made the mistake of putting in regular gas. Caught it after tank half full but while on that tank, I accelerated to pass and the car died. It restarted and starts fine now but occassionally stalls at idle. Engine light is on and code is p0221 - throttle/pedal position

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  • jalbert41 Oct 03, 2009

    Is this something a do it yourselfer can do, or should the part be replaced by a pro.

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That error is telling you that the throttle position sensor is bad. If you replace it, that should fix the problem. If it doesn't you can return the part to the store, but make sure you tell them that you didn't use it.

The throttle position sensor is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the throttle valve butterfly.

Posted on Oct 03, 2009

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I will say as you know that,the spark plugs weren't your issue. That said,you and I know more than a dealer.
The level of fuel in the tank should have no bearing on idle & stall issues.
Why would a dealer release a vehicle,with idle issues,you brought it in for? Again the dealer. Is there a pattern here.
Sudden stall at idle-no previous problems!
Won't accelerate under load!

The cause??

Throttle Position Sensor
Idle Air Control-if so equipped
MAF Sensor
EGR Valve
Fuel Pressure Regulator
Vacuum Leaks
Etc
Does it have a Throttle Pedal Position Actuator,such as all the issues Toyoto had?
Do you have Stored Codes?

I would have a talk with a local shop and maybe consider leaving it for a few days,only if you know their good with these type issues and have an understanding that you control the billed hours your paying for.

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Dear atomicboy488,

A lot of Rain=Possible Water in the Gas=Erratic Running!
This sounds like it may be as simple as cleaning the water or gunk out of the gas tank which is what I always do 1st because it's easy and inexpensive.
If your fuel is contaminated with gunk, grime, WATER and/or bottom junk like rust this will cause stalling AND ROUGH ACCELERATION!
Try spraying a can of starter fluid in the air intake and see if it runs! If it does, it's most likely bad fuel or clogged injectors so....
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