One problem related to gas recirculation valve (egr valve) has been reported for the 2004 Mitsubishi Endeavor. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mitsubishi Endeavor based on all problems reported for the 2004 Endeavor.
Bought this 2004 Mitsubishi Endeavor used with 64k miles in January. Started using the air this summer and noticed driver's side floor is soaking wet after each use. Found online that multiple people are having this same issue. Called the dealership and they confirmed that Mitsubishi is aware of it and have put together a fix between $220-$350 but there is no re-call. I was told the problem is a failed seal in the a/c unit. Also, had to have the egr sensor replaced twice. Called Mitsubishi and they said nothing they can do because the car is out of warranty. It ran $400-$500 each time at the dealership.