Start/stop function
The start/stop function reduces fuel consumption, which in turn can contribute to an environmentally conscious driving style and reduced emissions.
Points to remember when using the start/stop function
For the start/stop function to work requires that a number of conditions are met.
The start/stop function is not activated
One or more criteria may mean that the engine is not switched off/the function is not activated.
- the driver has not fastened the seatbelt
- the car has not been able to reach a speed of approx. 10 km/h (6 mph) after starting, or the function has been activated a number of times successively
- the engine has not reached normal operating temperature
- the outside temperature is below approx. -5 °C (23 °F) or above approx. 30 °C (86 °F)
- the windscreen's electric heating is activated
- the environment in the passenger compartment deviates from the set values
- the driver is making large steering wheel movements
- the road is very steep
- the bonnet is opened
- the ABS system has been activated
- in the event of heavy braking (even without the ABS system having been activated)
- the capacity of the starter battery has fallen below the minimum permissible level
- many starts during a short period of time have activated the starter motor's thermal protection
- the exhaust system's particulate filter is full
- a trailer is connected to the car's electrical system.
Note
High current take-off may lead to battery capacity falling below the lowest permitted level, which temporarily limits the start/stop function. The engine then starts automatically without the driver lifting his/her foot from the brake pedal.
The start/stop function is not deactivated
One or more criteria may mean that the engine is not started/the function is not deactivated.
- the driver has not fastened the seatbelt
- gear position P is engaged and the driver door is open.
The start/stop function is deactivated without the brake pedal being released
In the following cases, the function may be deactivated and the engine started without the driver releasing the brake pedal:
- high humidity in the passenger compartment forms misting on the windows
- the environment in the passenger compartment deviates from the set values
- repeated pumping of the brake pedal
- the bonnet is opened
- the capacity of the starter battery has fallen below the minimum permissible level
- the driver's seatbelt is unbuckled and the gear selector is in position D or N
- the gear selector is moved from position D to position R or M
- the driver door is opened with the gear selector in position D.