W204 C Class service indicator reset (12 and 4 button steering wheels)
12 Button:
Ignition to position 1
Press left arrow repeatedly until Trip item shown
Before it dissappears (about 5 seconds) press the accept phone button and keep pressed and within 1 second also press and keep pressed the OK button
- keep these pressed for about 5 seconds and the Workshop menu then appears.
Press the down button repeatedly until Assyst Plus is highlighted & press OK
Press the down button repeatedly to Full service and press OK - current service items are shown, so note these down
Press the down button repeatedly until Confirm Service, & press OK
(may have to confirm oil type depending on engine)
Press the down button until you see YES, and hit OK ("No take back appear possible")
Press the down button until you see Confirmation and hit OK ("full service carried out") is shown
Press the single "return" button and OK buttons until back to normal
Turn off
4 Button:
Ignition in position 1
Press R button, keep pressed and press the + button within 1 second
Press system selection button (above R) - "Assyst Plus" appears
Press R button "Service data" appears
Press system selection button "Full service appears"
Press R button - current service items shown
Press system selection button repeatedly until 'confirm service?" appears
Press R button - "service completed' appears - (may also have to confirm the oil type)
Press + button - "no takeback" is shwon
Press + button "full service carried out" shown
Press system selection button repeatedly until back to normal display
Turn off igniton
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