One problem related to gasoline engine has been reported for the 2004 Ford Taurus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Taurus based on all problems reported for the 2004 Taurus.
Rough idle, taken to dealer under warranty and was told Ford was aware of problem and had issued a computer update for the issue. Car was serviced and idle was only improved for 1 week or less. Idle continues to be rough and shop has not been able to identify the problem. This has been problem since the day I purchased the car.