One problem related to check engine light on has been reported for the 1999 Mercury Grand Marquis. The most recently reported issues are listed below.
While driving, (at any speed)the car's engine shut down several times. Each time I heard a "beep" and warning lights came on- check engine, traction control and abs. After a minute or so, the engine would start normally. The engine shut down 6 times ! each time I heard the "beep" and warning lights illuminated including traction control and check engine lights. I was on my way home with my newborn in the car,it just cuts off, and it nearly caused an accident on the highway as many other cars almost ran into me because the car shut off while I was driving on the highway. This is a very dangerous condition, especially as power steering and power brakes are lost on shut-down. I am literally afraid of driving my vehicle as no one knows what is wrong with my vehicle. This needs to be addressed ASAP as someone could get seriously hurt or killed. Including children!. . . . By the way, this has been happening all week.