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Acura
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Check Engine Light for Running Rough and Difficulty Starting on Acura MDX

Problem Description and Possible Solution

The exhaust recirculation valve (EGR) on the 2002-2017 Acura MDX may fail, causing:

  • Illumination of the check engine light
  • OBD trouble codes P0401 and P1491
  • Rough idle
  • Reduced fuel economy
  • Engine vibrations
  • Hesitation or stalling
  • Long cranking before engine starts
  • Failure of state or federal smog tests
  • The EGR valve has open and closed positions, and opens or closes on command from the computer.

    Exhaust gases constantly pass through the valve when it is open, leaving carbon deposits on the valve. These carbon deposits may lead the the valve sticking in the open or closed position.

    To correct this issue, sometimes it is sufficient to clean the valve, but replacement is recommended in all cases.

    For further information on your vehicle's issue, try out our diagnostics tool here.

    Problem Data
    RepairPal Verified
    Average mileage: 118,800 (97,000–150,000)
    17 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
    26 people reported this problem
    Comments
    Viewing 1 - 4 of 4 comments
    My check emissions light would sporadically flash on and off for a few weeks. The dealer said it could be the gas cap. After it started to stay on, I took it in and found that it was a failed valve EGR Valve. Had it replaced and it solved the issue.
    EGR valve failed or so it appreared and check engine light came on. Removing the valve and giving it a good bath in Sea Form resolved the problem and it is still going strong after 10K miles of use. Better still, just replace with a new genuine value from Acura. Very easy to do..