2004 Mercedes-Benz M-Class Review

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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 ...

Hiding display messages
You can hide some display messages with a low priority. ► Press the , button on the steering wheel to select another display. or ► Press the R reset button on the instrument clus ...

Front air bags
The front air bags increase protection for the driver's and front-passenger's head and chest. Driver's air bag 1 deploys in front of the steering wheel; front-passenger front air bag 2 depl ...