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.

A: If you got code P0401 for the EGR system ma...

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Car spits out white smoke when started after sitting for a short time

I have seen this many times on this engine. When this occurs during startup it is because of failed valve stem seals. In some cases the piston rings may be leaking also, but you would get smoke all the time...

Q: I put a cold air intake on my car I have replace the O2 sensor that is failing area code p0151 I'm not sure what to do mass is new

Hello. If the P0151 code persists after replacing the oxygen sensor, then it may be possible that the issue is with the wiring. If there is any damage or wear to the oxygen sensor connector or wiring there may be...

Q: Failed emissions, says that bank system 1 is too lean. The car had sat for almost a year.

Hello there, thank you for asking about your 1999 Nissan Altima. You need to fix any vacuum leak where un-metered air is getting in to the intake manifold. The additional air getting into the engine will cause the lean codes....

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.