W205 under dash trim panel

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Sparkyme24

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Location
London
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Mercedes 2015 saloon bluetec
Which cable connects to the port highlighted in red please? Or what’s the port for?
 

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Looks like the footwell air duct temperature sensor. Part of the heating system
 
By reading the fault codes in the air conditioning system. It’ll say the footwell sensor is open circuit if it isn’t plugged in. The symptoms you’ll see if that sensor is unplugged might be more difficult to detect. If it was winter, cold feet probably
 

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