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How to start the Mercedes Sprinter if the key doesn't work and the emergency start is not recognised

Model: Mercedes Sprinter MK 2, W906 - Years: 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
Part: Key

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The "key not recognised" error or failure to start the emergency system on our Sprinter is a common issue that can be quite troublesome. First, check the "ignition slot": The official Mercedes manual states that in case of radio interference or recognition problems, the first thing to do is place the key in the designated slot.

However, the most common cause is the key battery: the vast majority of unrecognised key cases on the Sprinter are due to a flat or weak remote battery. Often, the problem is so subtle that the light on the key may still illuminate, but the signal is not strong enough.

Changing the battery is the first step to take. If it’s not the battery, it could be the "steering lock"; the mechanical steering lock may have engaged.

Try moving the steering wheel from side to side while attempting to turn the key. If the onboard voltage is too low, the system may not recognise the key. Switch off all electrical loads (lights, air conditioning) and try again.


Posted on 20 June 2026 by ScegliAuto


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by ScegliAuto

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