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On average, the cost for a Mercedes-Benz S420 Idle Control Valve Replacement is $442 with $347 for parts and $95 for labor. Prices may vary depending on your location.
| Car | Service | Estimate | Shop/Dealer Price |
|---|---|---|---|
| 1999 Mercedes-Benz S420V8-4.2L | Service typeIdle Control Valve Replacement | Estimate$809.87 | Shop/Dealer Price$1001.09 - $1535.38 |
| 1998 Mercedes-Benz S420V8-4.2L | Service typeIdle Control Valve Replacement | Estimate$789.87 | Shop/Dealer Price$981.12 - $1515.43 |
| 1996 Mercedes-Benz S420V8-4.2L | Service typeIdle Control Valve Replacement | Estimate$789.87 | Shop/Dealer Price$981.12 - $1515.43 |
| 1997 Mercedes-Benz S420V8-4.2L | Service typeIdle Control Valve Replacement | Estimate$789.87 | Shop/Dealer Price$981.08 - $1515.36 |
| 1995 Mercedes-Benz S420V8-4.2L | Service typeIdle Control Valve Replacement | Estimate$789.87 | Shop/Dealer Price$981.15 - $1515.48 |
| 1994 Mercedes-Benz S420V8-4.2L | Service typeIdle Control Valve Replacement | Estimate$789.87 | Shop/Dealer Price$981.12 - $1515.43 |
The Idle Control Valve is designed to control and maintain a consistent engine idle speed. The valve helps counter anything the driver may do to put extra load on the engine, such as turn on the air conditioning, sound systems, lights, etc. When the car is cold, the idle control valve helps the engine start.
The idle control valve usually goes bad because of excessive carbon buildup in the intake manifold.
It is a good idea to get an air induction service performed every 3 to 4 years. This will ensure that the carbon does not build up on the valve. When you are getting the idle control valve replaced, your mechanic should inspect the vacuum lines for leaks. If the vacuum is leaking, it will mimic the symptoms of a bad IAC valve.
The idle control valve is responsible for maintaining a constant and consistent engine. It achieves this by ensuring that the idle speed is always constant. Many factors – such as a cold engine, the radio, or the air conditioning – effect the idling speed of the engine, so the idle control valve neutralizes these outside factors, and makes sure that the engine is consistently idling at a stable speed. When the idle control valve malfunctions, the idling speed is no longer regulated. This means that if you turn on the radio or the air conditioning, which requires power, your engine may stall. It also means that your vehicle may not be able to turn on.
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