One problem related to crankcase (pcv) has been reported for the 2003 Ford Expedition. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Expedition based on all problems reported for the 2003 Expedition.
Since we have owned this 2003 Expedition we have had the windshield replaced due to noise and loose stripping, then, the contracting person put in the wrong years windshield. The emissions canister was cracked and was replaced. The muffler would pop after turning off the engine, but couldn't be fixed until verified by Ford. I waited for 3-4 hours one day with 3 children while they let my car run and shut off. We finally called ahead, and had them wait outside on us until we killed the engine to hear it pop. It was a poor muffler weld and was repaired. The side molding rattled badly, and was terribly faded, and that was replaced. The door gets a lot of wind noise , and a whistle in the window. They said window passed the dollar bill test and was fine but it still whistles. They, put a clear strip along inside of door to help noise. It doesn't. Then ,the rear continental tire had such horrible, uneven wear, it was extremely dangerous. Bought new tires for $600. Then rear differential malfunctioned, and would make a grinding on turning left or right. They fixed that in March 2005, and it just started doing it again. Now, there is a strange noise when revving the engine to drive coming from under the hood. It is going in tomorrow for the noise and the rear differential. On top of all the repairs, we have had a squeaky brake issue. Also, they have said they were good. They just get a lot of brake dust, just sand them. Our side windows shimmies all the time. ! I did invest in an extended warranty!.