On my 03 doblo 1 door remains open after I lock it centrally
Its the rear sliding door, checked contacts they look fine and all the other doors including boot doors lock but I have to lock this 1 manually. Please help cause I'm quite forgetful and have left van unsecured. Thanks in advance

The contact pins need a clean & a bit of lubrication to keep them moving.

Could be anything from a frozen spring to a dirty contact preventing the electricity getting to the solenoid :yuck:

It could even be the solenoid itself is knackered, but I would start at the contacts