Skip the auto shop - Our mechanics make house calls

Q: Check engine light, EGR.

asked by on

Just had one of your mechanics replace the EGR as I had a check engine light and failed smog. Check engine light came back on within an hour and diagnostics show it is still an EGR problem. What next?

My car has 136000 miles.
My car has an automatic transmission.

Hello. Thank you for writing in. The issue you are having may not be directly related to the EGR valve, but may pertain to the passages around it. Carbon build up in the passages around the EGR valve will inhibit the flow of exhaust gases that are being recirculated into the intake. These can be cleaned by hand with a number of chemicals on the market after removing necessary components to access them. With those properly cleaned, you will want to reinstall the EGR valve. At this point make sure that your connections are clean, dry, and tight. The other issue is that the valves often release extra exhaust into the system when they shouldn’t be, however this should have been resolved with a new unit and seals. Make sure that the unit’s manifold is not damaged as well. Clean the EGR valve’s passages, and make sure the new unit is installed correctly.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: When I accelerate, my car hesitates, the rpms bounce, and sometimes i have a missfire flashing CEL

Hello and thank you for your question. With having your engine with bank 1 being lean (lack of fuel), the symptoms are showing that there is a problem with fuel delivery or excessive heat. If the EGR valve was to...

Q: Ignition problem on 2004 Chevrolet Suburban

It sounds like you may have a failing relay or fuse block, either of which could stop certain components from being powered up, which may keep it from starting. It's also possible that even though the ignition switch and key...

Q: Rattle sounds undercarriage

There are countless potential causes for your noise. It could be anything from a loose heat shield, to a worn strut mount. I suggest you have a trained professional, such as one from YourMechanic, listen to your vehicle firsthand to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...