Mercedes-Benz ML250 EGR Vacuum Modulator Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(5,647)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(5,647)

EGR Vacuum Modulator Replacement Service

How much does a EGR Vacuum Modulator Replacement cost?

On average, the cost for a Mercedes-Benz ML250 EGR Vacuum Modulator Replacement is $201 with $96 for parts and $104 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Mercedes-Benz ML250L4-2.1L Turbo DieselService typeEGR Vacuum Modulator ReplacementEstimate$318.91Shop/Dealer Price$386.27 - $545.02
Show example Mercedes-Benz ML250 EGR Vacuum Modulator Replacement prices

What is the EGR Vacuum Modulator all about?

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.

Keep in mind:

  • The EGR system assists in reducing engine emissions. An improperly operating EGR system can cause a smog test failure.
    • Vacuum hoses become brittle over time. Take precautions to not damage the vacuum hoses when working on the EGR system.

How it's done:

  • 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.

Our recommendation:

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.

What common symptoms indicate you may need to replace the EGR Vacuum Modulator?

  • Check Engine light is on
  • Engine knock at idle
  • Engine idles rough

How important is this service?

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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(5,647)

Rating Summary
5,256
190
54
28
119
5,256
190
54
28
119

Chris

22 years of experience
2247 reviews
Chris
22 years of experience
Mercedes-Benz ML250 L4-2.1L Turbo Diesel - Brake Pads Replacement (Front, Rear) - Trabuco Canyon, California
Great job, showed up on time, completed the work on time for far less than the dealership charges. What else is there to say.

Mohammed

9 years of experience
152 reviews
Mohammed
9 years of experience
Mercedes-Benz ML250 L4-2.1L Turbo Diesel - Brake Pads Replacement (Rear) - Cary, North Carolina
All good. Knowledgeable and friendly. Highly recommend!

Edwin

17 years of experience
8 reviews
Edwin
17 years of experience
Mercedes-Benz ML250 L4-2.1L Turbo Diesel - Oil Change - Cary, North Carolina
Edwin was awesome, not only was he knowledgeable about my car he is just an all around great guy and fun to chat with. I will definitely book Edwin again

Will

12 years of experience
49 reviews
Will
12 years of experience
Mercedes-Benz C240 V6-2.6L - Oil Change - Glendale, Arizona
Will was extremely knowledgeable and I will definitely hire him again. He was great and you won't be disappointed if you chose Will as your mechanic. He came to my house and answered a lot of my questions, and was very sweet and kind. He goes out of his way to explain things. He is really a nice guy and does a wonderful job. Definitely I will use his service again. Thank you Will!

Excellent Rating

(5,647)

Rating Summary
5,256
190
54
28
119
5,256
190
54
28
119
Number of Mercedes-Benz services completed
62117+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

A Buyer’s Guide to the 2012 Hyundai Elantra
Car Car buyers looking for an economical, fuel-efficient sedan that’s also a little sporty and very attractive will love the 2012 Hyundai Elantra. Not only does it have a great list of standard features that any driver would enjoy, but...
How to Flush Your Cooling System
Flushing Flushing the cooling system (https://www.yourmechanic.com/article/what-does-it-mean-to-flush-fluids-in-a-car) is part of every vehicle's scheduled maintenance. This procedure is usually required every two to four years, depending on the vehicle. It is important to perform this maintenance at its scheduled time because the...
P3418 OBD-II Trouble Code: Cylinder 3 Deactivation/Intake Valve Control Performance
What What the P3418 code means This code indicates that there is a problem with your intake valve on cylinder number 3. Your vehicle’s control module detects that the measured values from the TP sensor, MAP sensor, and MAF sensor...

Can't find shop who will replace timing belt on foreign car

Hello. It is very hard to say when a timing belt will break (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-timing-belt) as some fail before the required mileage and some go way beyond the recommended period. Either way you need to have this done as soon as...

When I drive my car for 5 minutes, it shifts fine then slips into neutral. I have to shut it off for 1-2 minutes but it will do it again.

Hello, thanks for writing in today. It is possible that this is a speed sensor (https://www.yourmechanic.com/services/speed-sensor-replacement) failing issue. There are a few things to check for. Are there any problem codes thrown? What color and smell does the transmission fluid...

Skipping 2nd gear

Hi there. It sounds like you may have a shift solenoid or sticking valve concern. Are there any warning lights illuminated? What is the current condition of the transmission fluid? Proper testing of the shift solenoids will require a capable...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com