Skip the auto shop - Our mechanics make house calls

Q: EGR valve and vacuum

asked by on

The Check Engine Light is on. According to Advanced Auto, it shows that the EGR valve and EGR vacuum modulator may need replacement or to be cleaned.

If you got code P0401 for the EGR system malfunction, then the system would need to be tested to see whether or not the vacuum modulator valve is holding vacuum and can control the EGR valve. These tests are needed to see if the valve and modulator are good or not; the EGR tube could be in need of cleaning. If all this is done then a proper diagnosis can be given. I recommend having a mechanic, such as one from YourMechanic, run a diagnostic to see if your EGR vacuum modulator requires replacement, or if another path of repair will be necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What is the battery saver function on my car?

Your car is equipped with a battery saver function to help prevent the battery in the car from dying, as well as the battery in your remote/electronic key. This is a handy thing to have, but you need to know...

Q: What parts are needed to replace all of the engine mounts?

Hi there. There are 4 engine and transmission mounts that your vehicle uses. The engine needs 2 dog bone design mounts and 2 hydraulic compression mounts. Some 3.3L engines may only have 1 dog bone mount. I recommend taking pictures...

Q: My car shows the Check Engine Light and DPF lights and coil light on the dashboard. What action should I take?

Hi. The EGR valve needs to be replaced and the passages to the EGR need to be cleaned. The EGR location is very tricky to get to so you may need a professional technician (such as one from YourMechanic) who...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...