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Inside each fuel injector is a small needle valve called a pintle valve that tends to wear down due to repeated cycling. As it wears, it can cause fuel to leak between the valve and the sealing surface. Sometimes, fuel injectors can be cleaned; restoring performance and fuel economy back to stock levels. This is done by ultrasonic cleansing, using sound waves to break up the small bit of dirt and corrosion on the pintle valves. If the injectors are beyond cleansing, then replacement is your only option.

Looking for injectors for your Mercedes-Benz? Find your application HERE within our comprehensive parts catalog.

We also have a thorough DIY tech article here:
Fuel Injector Replacement W210 M104

Let us know if you have any questions!