Maintenance: Service and Repair

O2 Sensor Replacement Control Unit:

On model 201 with 102 engine (California specification only), the oxygen sensor must be replaced when the warning lamp (A1e33) illuminates for the first time at 60,000 ± 250 miles. After replacing the sensor, the warning lamp may be switched off via the button (arrow) on the oxygen sensor replacement indicator module (N44/1), The button must be pressed for longer than 2 seconds to turn off the lamp. With ignition switch in position "2", the lamp remains lit even after resetting the control module. The lamp will only go out after the engine is started (circuit 61 recognition). The previously recorded mileage remains stored. The warning lamp will illuminate for a second time at 120,000 miles.

NOTE: After the 120,000 mile indication, the on-off ratio should be checked, and the oxygen sensor should be replaced only if necessary.

If the oxygen sensor is replaced outside the interval limit, the oxygen sensor replacement indicator control module (N44/1) must be replaced.
Starting in model year 1993, the control module can be reset as often as needed.

The O2-sensor replacement control unit is located in the passenger side footwell.