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    Rvlec's Avatar
    Rvlec Posts: 68, Reputation: 2
    Junior Member
    		  
    #1

    Jun 30, 2011, 05:25 AM
    Why is check engine light still coming on after replacing egr valve?
    I recently replaced the EGR valve on my wife's 1999 Honda Odyssey. I took it to the auto parts store and they did the diagnostic test. I bought new EGR and put it on. I reset the check engine light by disconnecting the battery cable. This lasted just a short while and the light came back on. I bought a scan tool and reset it with that. A few miles down the road the check engine light came back on. It is still coding for the EGR valve. Did I get a bad EGR? I did notice on the replacement EGR, the port (opening) wasn't as large as the original EGR.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jun 30, 2011, 06:56 AM

    . Return the part and go OEM, if necessary. The new part sounds suspect.

    . Ensure all related passages are clear.

    . Use SAE 5W-30 synthetic engine oil (e.g. Mobil 1 or Pennzoil Platinum). They dramatically help EGRs and the rest of the emissions control system to stay much cleaner.
    odinn7's Avatar
    odinn7 Posts: 7,691, Reputation: 1547
    Entomology Expert
    		  
    #3

    Jun 30, 2011, 08:11 AM
    Some codes are caused by other things related to the actual part. The code doesn't always identify the actual exact thing that is bad. You could have a bad vacuum line to the EGR or something like that. I do agree with TxGreaseMonkey in that you should return it and spend the money for an OEM part if you check passages and vacuum lines/hoses and find nothing wrong.
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