214 Driving tips Automatic regeneration can begin either while the vehicle is in motion or stationary. Automatic regeneration only begins when all operating conditions have been fulfilled, such as sufficiently high engine oil and exhaust temperatures, for example. If an operating condition is no longer fulfilled while regener- ation is in process, the Й indicator lamp goes out and the regeneration is interrupted. When all operating conditions are fulfilled again, the regeneration starts again automat- ically. Avoid interrupting the journey as long as the Й indicator lamp is lit. Breaks in your journey increase the required regenera- tion time, which leads to increased fuel con- sumption.
X To switch on/off: press button ; . If indicator lamp : in the button lights up, regeneration is blocked. Only switch on the regeneration block for the duration of the hazardous condition. If you have switched on the regeneration block, regeneration remains disabled even after starting the engine again. This can result in a large number of particles quickly collecting in the diesel particle filter. In this case, the on- board computer informs you that the regen- eration block is still active by means of the В Regeneration disabled message in a grey event window.
Driving mode Starting stationary manual regenera- tion i The engine noise and the engine idling speed may change while regeneration is in process. During the first few regenerations in par- ticular, smoke and noise generation can occur in the area of the exhaust system. Regeneration block If you need to prevent the raised exhaust temperatures which occur during regenera- tion, you can block regeneration, e.g.: R when driving into a hazard area R when working with intense pollution of the vehicle with dry or flammable materials Automatic and manual regeneration can then no longer be started and any current regen- eration will be interrupted.
Start manual regeneration when the on-board computer has prompted you to do so with corresponding event windows ( Y page 131). In special cases and for official vehicles, man- ual regeneration can be initiated earlier for preventative particle filter regeneration. Man- ual regeneration lasts approximately 30 minutes up to a maximum of 60 minutes. X Make sure the regeneration block is switched off ( Y page 214). X Stop the vehicle, paying attention to road and traffic conditions, and keep the engine running. While doing so, maintain a distance of at least one metre to other vehicles, other objects and all flammable materials. X Apply the parking brake.