All fortwo 451s are fitted with a service indicator which will inform you when your next service is due. As a general rule of thumb, a service is due based on the following rule:

• Every 13,000 miles (15,000km) or every year, whichever occurs sooner (MHD)
  
• Every 10,000 miles (13,000km) or every year, whichever occurs sooner (Brabus)

However, there are a number of other factors which contribute to the service interval period so do not be surprised if the above rule isn't followed precisely. Such factors include how hard the car is driven, how many times it is stopped/started, an accumulation of minor fault codes, etc.

Your service indicator is there to tell you whether a service is due, or overdue.

To see how many miles (or kilometers) there are until your next service, double press the left top button on the front of instrument display. This will not tell you how many days there are to go.

When there are approximately 1,500 miles or 30 days until your service is due, the display will notifiy you of this when you start the car. The number of spanners will tell you whether or not it is due a minor (A) or major (B) service.

If your car runs over its service due date or mileage, it will show a minus infront of the number of days or hundreds of miles it is overdue.

The following image shows that this fortwo is overdue a B-Service (note the 2 spanners) by 300 miles:

Once the counter is reset, it will switch to the next service mileage interval and change the number of spanners. In the following example, the next service will be an A service in 13,000 miles time.

To reset your service counter, follow the procedure in this guide.