Question about 2004 Mazda 6
P0401 is a low egr flow code. It is rarely the EGR valve and more often than not the DPFE sensor that has failed. To find the DPFE sensor follow the metal tube from the EGR valve to the exhaust pipe. There will be two rubber hoses attached to that tube. The DPFE sensor will be on the other end of those hoses.
Make sure there are no holes in the rubber hoses. This can cause false codes as well.
Posted on Nov 07, 2010
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
May 11, 2013 | 1997 GMC Sonoma
Mar 31, 2013 | 2001 Isuzu Rodeo
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Dec 06, 2012 | Cars & Trucks
Nov 28, 2012 | Honda Accord Cars & Trucks
Sep 04, 2011 | 1998 Ford Taurus
Jul 08, 2011 | 1999 Mercury Sable
Apr 14, 2011 | 2001 Mitsubishi Mirage
Mar 13, 2011 | 2004 Hyundai Santa Fe
Jun 25, 2010 | 1998 Ford Explorer
May 05, 2010 | 1996 Oldsmobile Ninety Eight
Jul 03, 2017 | 2004 Mazda 6
304 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: