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On average, the cost for a Mercedes-Benz C400 EGR Vacuum Modulator Replacement is $219 with $114 for parts and $104 for labor. Prices may vary depending on your location.
| Car | Service | Estimate | Shop/Dealer Price |
|---|---|---|---|
| 2015 Mercedes-Benz C400V6-3.0L Turbo | Service typeEGR Vacuum Modulator Replacement | Estimate$354.51 | Shop/Dealer Price$430.77 - $616.22 |
Your vehicle’s exhaust gas recirculation (EGR) system is used to reduce your engine’s emissions by lowering the combustion chamber temperature. This produces less nitrous oxides, and burns pollutants contained in the exhaust gas that are reintroduced into the intake manifold. If the EGR valve opens and allows exhaust gases into the intake, the engine runs more smoothly and efficiently. However, this is not the case at idle, when the engine needs the most vacuum for proper operation.
If the EGR valve opens at idle, you can experience a rough idle and possibly a knock. Engine power is negatively affected at low RPM’s. Engineers implemented a control that closes the EGR valve when the engine is running at lower RPM’s. The engine produces lower vacuum at lower engine speeds, so it’s natural that the control is modulated by the engine’s own vacuum. The EGR vacuum modulator is a diaphragm that closes when the engine vacuum drops to idle, and opens as soon as the vacuum increases. It’s also known as a vacuum modulated valve. If the EGR vacuum modulator is leaking vacuum, is blocked internally, or is leaking, the Check Engine light will come on and the engine may start to knock.
The EGR vacuum modulator is verified that it needs to be replaced. The engine top trim cover is removed to access the modulator.
The defective EGR vacuum modulator is removed from the bracket near the EGR valve and is disconnected.
The new EGR vacuum modulator is installed and reconnected.
The engine is started and the EGR vacuum modulator is tested for computer codes and operation.
The vehicle is road tested to ensure proper operation of the EGR vacuum modulator.
The EGR vacuum modulator does not have a replacement interval. It will likely need replacement at some time because it does contain a filter. It can be inspected any time a vacuum test needs to be performed on the engine vacuum. If the EGR vacuum modulator is deemed to be faulty, you will need to have it replaced by one of our expert technicians.
The EGR system partly controls your vehicle’s emissions, and a faulty EGR vacuum modulator can cause your car to fail a smog test. In addition, your vehicle may not idle, or may knock at idle. It is recommended to replace a faulty EGR vacuum modulator as soon as possible.
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