One problem related to engine shut off without warning has been reported for the 1999 Mercury Mountaineer. The most recently reported issues are listed below.
While driving 45mph engine just shutoff without warning.
| Check Engine Light On problems | |
| Gas Recirculation Valve (egr Valve) problems | |
| Engine And Engine Cooling problems | |
| Gasoline Engine problems | |
| Engine Shut Off Without Warning problems | |
| Oil Pump problems |