See also:

Checking the battery
- Press the or button. The battery is working properly if battery check lamp 1 lights up briefly If battery check lamp 1 does not light up briefly during the test, the battery is discharg ...

High outside temperatures
If DEF heats up to over 122 °F (50 °C) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result. WARNING When o ...

Checklist before driving off-road
– Engine oil level: check the engine oil and add oil if necessary. When driving on steep gradients, the oil level must be sufficiently high to ensure a correct oil supply in the vehicle. – DEF ...