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On average, the cost for a Mercedes-Benz S420 Car Air Pump Check Valve Replacement is $183 with $88 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 typeCar Air Pump Check Valve Replacement | Estimate$546.59 | Shop/Dealer Price$671.99 - $1008.82 |
| 1997 Mercedes-Benz S420V8-4.2L | Service typeCar Air Pump Check Valve Replacement | Estimate$526.59 | Shop/Dealer Price$652.02 - $988.87 |
| 1995 Mercedes-Benz S420V8-4.2L | Service typeCar Air Pump Check Valve Replacement | Estimate$270.15 | Shop/Dealer Price$331.47 - $475.99 |
| 1996 Mercedes-Benz S420V8-4.2L | Service typeCar Air Pump Check Valve Replacement | Estimate$526.59 | Shop/Dealer Price$651.98 - $988.80 |
| 1994 Mercedes-Benz S420V8-4.2L | Service typeCar Air Pump Check Valve Replacement | Estimate$270.15 | Shop/Dealer Price$331.50 - $476.04 |
| 1998 Mercedes-Benz S420V8-4.2L | Service typeCar Air Pump Check Valve Replacement | Estimate$526.59 | Shop/Dealer Price$652.02 - $988.87 |
In a secondary air injection system, air must be injected into the exhaust system, but exhaust fumes must not be able to escape. This is accomplished by using a one-way air pump check valve. Think of it as a one-way street -- air can enter, but exhaust gases can't leave.
These secondary injection systems are used to ensure a fuller burn of spent exhaust gases, which both improves fuel economy and eliminates pollution from the vehicle exhaust. It’s an important part of your emissions system. Generally, the air pump check valve is mounted near the top passenger side of the engine, although this can vary. Some vehicles have more than one check valve, as well.
Over time, the air pump check valve is subject to not only high heat, but also other forms of damage. It can deteriorate and degrade. While there is no set lifespan for these components, they can and do fail.
A secondary air injection system is an important part of your emissions control, and the air pump check valve is a critical component. If it fails, it’s possible for exhaust gases to escape, or for fresh air to be blocked from entering the exhaust system. If you suspect a problem with your air pump check valve, have it diagnosed and repaired by one of our expert mechanics.
While you won’t notice much in the way of performance degradation if the check valve fails, your Check Engine light could come on, and your car will not pass emissions testing. Because of this, you should replace a faulty air pump check valve as soon as possible.
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