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 opening the filler cap of the DEF tank ammonia gas vapors may escape. Refill DEF in a well ventilated area only. Ammonia gas vapors have a pungent odor and are particularly irritating for your skin, mucous membranes, and eyes. Inhaling ammonia gas vapors will cause burning eyes, nose, and throat, as well as coughing and watering eyes.

    See also:

    Fuel requirements
    Gasoline engines Use only premium-grade unleaded gasoline. The octane number should be at least 91. Details can be found on the gas pump. The octane number is the average value of the Researc ...

    License plate lamps
    Switch off the lights. Open the tailgate. Press lug 2 of license plate lamp 1 in the direction of the arrow and remove license plate lamp lens 1. Remove license plate lamp lens 1. Repl ...

    Recovering a vehicle that has become stuck
    Pull away smoothly, slowly, and in a straight line when pulling out a vehicle that has become stuck. Excessive tractive power could damage the vehicles. If the drive wheels have become stuck in ...