Mercedes Benz C-Class (W204) 2007 - 2014 Training Manual: Manually releasing the park pawl (vehicles with automatic transmissions)

In the case of an electrical malfunction, the selector lever can be manually released from the P position, e.g. if the vehicle is to be towed.

Firmly push down on the parking brake.
Press the selector lever cover 1 to the left and pull out from above.
Press the release 2 down and move the selector lever from the P position at the same time.
The selector lever can now be moved freely until it is again brought to "P" position.

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Mercedes Benz C-Class. Emergency Operations

Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Seats and stowing: Easy entry and exit feature
Using the easy entry and exit feature WARNING Risk of accident when driving off while adjusting the easy exit feature ‑ If you drive off while the easy entry and exit feature is making adjustments, you could lose control of the vehicle. Always wait until the adjustment process is complete before d ...