Auto Service

1. Park the car on level ground and turn off the engine. Turn the key forward one click, starting the electrical systems but not the engine. Open the hood.
2. Locate the 20-pin diagnostic connector on the drivers side of the engine near the intake manifold. The diagnostic connector has a bright red cap. Turn the diagnostic-connector cap counterclockwise until it comes free.
3. Align the recesses in the oil-reset tool with the diagnostic connector pins. Plug it in by pushing straight down.
4. Activate the reset function on the tool by pressing the start button.
5. Check the oil-change reminder light on the dash to confirm the reminder has been reset.

1. Insert the key in the ignition switch and turn it without starting the car. Pay attention to the display on the instrument cluster between the speedometer and the tachometer.
2. Press the lower left button on the left side of the steering wheel. There are four buttons on the left side of the steering wheel. After pushing the button, the display will reveal why the check engine light is lit. Usually it indicates that the car is due for service. Push the lower left button on the steering wheel again and the vehicle mileage will show on the display.
3. Press the lower right button on the left side of the steering wheel. This will again show the reason why the check engine light is on.
4. Locate the reset button on the left side of the instrument cluster. Press the reset button and hold it until the display reads To reset: Press reset button for 3 seconds.
5. Push the reset button again and hold the button in until the display indicates that the system has been reset. The display will also inform you of the next service date according to mileage.

Resetting Your Service Indicator Light
1. Put your key into your cars ignition and turn it to the first position. Make sure your vehicles mileage is showing. (The referenced website has instructions for all Mercedes models. These instructions are for the Models 221 and 216.)
2. Press and hold the telephone button on your steering wheel. Immediately press the "OK" button and hold them both down for at least five seconds. If done correctly the shop menu will be shown on your display.
3. Press the "Down" button on your arrow pad until you highlight the "Assyst Plus" option. Press the "OK" button.
4. Press the "Down" button until you highlight "Service carried out." Press the "OK" button.
5. Press the "Down" button until you highlight "Service due." Press the "OK" button.
6. Press the "Down" button until you highlight "Full service." Press the "OK" button. This should reset your service indicator light.

1. Press and hold the Trip Meter Reset button.
2. Turn the key in the ignition to On without cranking the engine.
3. Release the Trip Meter Reset button when the word RESET appears on the instrument panel.
4. Press and hold the Trip Meter Reset button until RESET blinks off and on.
5. Depress the Trip Meter Reset button to reset the service indicator.

1. Open the fuse panel cover by turning the knob on the fuse panel counterclockwise and pulling down on the cover.
2. Plug the electrical connector on the OBD tool into the matching input on the fuse panel.
3. Turn the ignition key to the "II" position and wait for the service reminder light to go out.

1. Insert the key and switch the ignition to position I.
2. Press the display button on the multifunction steering wheel until the B Service notification is displayed.
3. Press and hold the reset button located to the left of the instrument cluster until the B Service message resets.