One problem related to engine noise has been reported for the 2004 Chrysler Concorde. The most recently reported issues are listed below.
The car head lights & dash lights dim when driving. If you play with control switch it sometimes makes them work right. Car stalls and doesn't want to restart. We have done the recall for exhaust. The a/c all the sudden started making noises when stalling and now does not work makes a hissing sound. I have kept this car in great shape and have it maintained & serviced regularly. I have had several sensors replaced and the engine light refuses to go off. I put it in the shop and they said it was because gas cap was loose. That wasn't the case, car is now sitting in driveway unable to start. Had the heads removed and fuel injectors cleaned and car still won't run.