Wagoneer L6-242 4.0L VIN M FI (1988)
Emissions Maintenance Light: Service and Repair
The life cycle of the timer coincides with the emission maintenance interval of approximately 82,500 miles. The timer can not be reset after reaching this
mileage interval. The timer can only be replaced or disconnected.
The oxygen sensor and the timer are interdependent. If the timer should fail prematurely, the oxygen sensor must be replaced along with the
timer. This is important in preserving the correct sensor replacement interval and insuring proper engine performance.
The emission maintenance timer is located under the dash next to the steering column. On vehicles with cruise control, the timer is located behind the
cruise control module.
