Jeep Wrangler/YJ 1987-1995 Repair Guide

Emissions Maintenance Reminder Light


See Figure 1

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Fig. Fig. 1: Emission maintenance timer

Most Jeep vehicles are equipped with an Emissions Maintenance Reminder (EMR) light. The EMR light comes on after the vehicle has reached 82,500 miles (132,767 km) and informs the owner when oxygen sensor and other related emissions service is required. The light is located in the instrument cluster.

The oxygen sensor and EMR are interdependent. When the reminder light illuminates, the oxygen sensor and EMR should be replaced simultaneously. This is important in ensuring proper engine performance. Maintenance reminders for 1991 vehicles are reset using a Diagnostic Readout Box (DRB). See the DRB instruction information for further instructions.

Resetting or replacing the EMR without performing the required maintenance is a violation of federal law. Only after performing the required maintenance, should the EMR be reset.

The maintenance reminder for pre-1991 vehicles cannot be reset after reaching the specified mileage, the unit must be replaced. The unit is mounted on the dash panel to the right of the accelerator pedal. To replace the reminder:

  1. Remove the attaching screws and disconnect the reminder electrical connector.
  3. Install the connector to the new EMR and replace the attaching screws.