Skip the auto shop - Our mechanics make house calls

Q: EGG code p0400, multiple cylinder misfire, removed and cleaned egr and pipe with no change

asked by on

Egr code p0400 muktiple cylinder misfire, removed and cleaned egr and pipe with no change My car has 195000 miles.
My car has an automatic transmission.

Hi there. The P0400 EGR (exhaust gas recirculation) valve code may not be a valve not working. This code description is a EGR flow malfunction. The fact that your vehicle has multiple cylinder misfires leads me to believe the valve may be stuck partially open.

Try removing the EGR valve and blow through the passage. If air flows, replace the EGR valve. If no air flows, it may be a control issue. This would require a scanner to monitor parameters and circuit tests to be performed. I recommend having your vehicle’s EGR code P0400 be diagnosed and repaired by a certified technician, such as one from 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
  1. Home
  2. Questions
  3. EGG code p0400, multiple cylinder misfire, removed and cleaned egr and pipe with no change

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: Can engine control module be repaired

Hello. I do not believe that any module or computer on a vehicle can be repaired. Unfortunately, these are sealed units and must be replaced if they fail. In addition, many engine computers require special programming from the dealership once...

Q: neutral safety switch problem

Hi there. It could be, a faulty neutral safety switch causing the engine not to turn over. Putting the gearshift lever into neutral and trying to start the vehicle may help confirm that possibility. A no crank situation could also...

Q: 1998 Mazda protege: Had the EGR valve replaced, cleared the computer codes, still get the check engine light then a EGR problem co

Code P0400 does not necessarily mean that there is something wrong with the EGR valve itself. The only way to condemn the EGR valve is to directly test it. In particular Code P0400 includes a circumstance where the EGR passages...

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 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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.