Join Date: Jul 2005
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If it's RF it should work from at least 20 feet away. The sensor won't be in the door, it will be somewhere in the car interior itself, typically behind some trim.
Boots and Halfords (and Maplins if you have a branch near you) are usually very cheap when it comes to buying the "button cell" batteries.
Currently in Ivor_E_Tower's garage:
2014 Captur dCi EDC; 2014 Ka 1.2 Zetec; 2015 C-Max 1.6 TDCI