Oxygen Sensor

After 30, 000 miles of vehicle operation, a warning light in the dash will come on, indicating that oxygen sensor servicing is required. Trace wire from oxygen sensor to plug and disconnect. On 528e, pull off protective metal plate.
On all models, remove oxygen sensor. With a light coat of copper paste applied to threads, install new sensor. On all except 528e, reset interval switch by pressing White button. On 528e, switch cannot be reset. Bulb must be removed from display panel to deactivate oxygen light.