One problem related to check engine light on has been reported for the 2001 BMW 740. The most recently reported issues are listed below.
The contact owns a 2001 BMW 740il. The vehicle was tuned up on October 6, 2007 and November 28, 2007. The vehicle began smoking and the add engine coolant light illuminated. The contact stated that this was the quickest the add engine coolant light has ever illuminated following a tune up. The dealer stated that the engine needed to be replaced. The current and failure mileages were 102,000.