One problem related to service engine light on has been reported for the 1999 Ford Expedition. The most recently reported issues are listed below.
The contact owns a 1999 Ford Expedition. The failure occurred in October 2007 and the again on March 21, 2008. The spark plug came out of the engine while driving 25 mph. He found the spark plug sitting on top of the engine. The service engine soon light was not illuminated until the following day after the failure occurred. The mechanic stated that your number three spark plug blew out the engine block. He also stated that if he were driving faster than 25 mph the spark plug would have gone through the hood and then the windshield. The manufacturer stated that the failure was not covered by the warranty and they are unable to assist him with the repair. The estimated cost to repair the vehicle was $3,000 to $7,000. The contact also filed a complaint with the consumer protection agency and was not given a case number to reference. The vehicle was serviced on a regular basis. There are invoices available to show each time the vehicle was serviced and diagnosed. The failure mileage was 11622 and the current mileage was 13000.