Emission Control Systems: Service and Repair

The emission maintenance timer will illuminate an indicator lamp on the instrument cluster when vehicle mileage has reached 82,500 miles. At this time, the oxygen sensor and PCV valve should be replaced, in addition to the other required emission maintenance scheduled for this mileage.

If the timer should fail before vehicle has accumulated 82,500 miles, the timer and oxygen sensor should both be replaced to maintain a proper sensor replacement interval.

After performing the required service, replace the emission maintenance timer as follows:

1. Remove emission maintenance timer to dash bracket attaching screws. The timer is located on the dash panel to the right of the steering column.

Fig. 6 Emission Maintenance Timer Replacement:

2. Remove timer from bracket, then disconnect electrical connector and remove timer from vehicle.
3. Connect electrical connector to replacement timer, then position timer to mounting bracket and install and tighten attaching screws.