If you have just refuelled the gas tank or if the coolant temperature is too low, the engine will initially start running in petrol mode. The engine will switch to natural gas mode as soon as possible.

The indicator lamp in the instrument cluster will light up as soon as the engine is running in natural gas mode Fig. 1. The indicator lamp will go out if there is no more natural gas left in the tank. The engine will switch automatically to petrol mode.