Skip the auto shop - Our mechanics make house calls

Q: Insufficient EGR flow code

asked by on

I am getting a P0401 code - insufficient EGR flow.

A: The EGR (Exhaust Gas Recirculation) valve i...

The EGR (Exhaust Gas Recirculation) valve is an emissions component that helps most vehicles run cleaner. The valve opens, allowing the exhaust gasses into the intake manifold to dilute the air/fuel mixture, and reduce NOx emissions. The computer monitors values concerning intake air, fuel, and exhaust readings, and captures the EGR fault this way. A malfunctioning EGR valve, or control valve, is common as carbon build-up blocks the the ports that connect the valve to the intake manifold. In the event of a faulty EGR valve or control valve, some time should be taken to inspect and clean any build-up left in the ports. Have a mechanic inspect your vehicle's emissions system, and perform any necessary repairs. Consider one of our expert team members here at YourMechanic.

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・Save up to 30%

Get a quote

What others are asking

Q: Swapping 98 5.9l engine for 96 5.2l

The first clue is the EGR system. One engine has it and the other does not. Even though it may be illegal for you to change your vehicle engine from a 98 to a 96, as long as it is...

Q: Car loses rpms when idling and dies when not giving it gas on first run.

Hello. It may be a problem with the choke on the carburetor. Try some carburetor cleaner in and around the carburetor, especially the choke plate. On a cold start no matter the temperature, the choke plate should be mostly closed....

Q: How do I turn on the automatic air conditioner?

When the weather gets hot outside, stay cool inside with an automatic air conditioning system in your Toyota Camry. It adjusts to provide just the right temperature for you and your passengers. Press the button that says Auto to...

Related articles

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...