Aux heater not working - 2509 heater booster positioner signals fault - w220 CDI 2003

Stavy1683

Stavy1683

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Nov 23, 2023
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Age
41
Location
Rowhedge, Essex
Your Mercedes
S-Class W220 320 CDI ALMANDINE-BLACK
My aux heater doesn't seem to be working it has the above stored code. Anyone experienced this code before?
 
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