I had the driver side go first, it would not lock with the fob most of the time, and I replaced with a new cheap copy from eBay about £25, works fine. If you buy the drivers side make sure it has the part for the key and is rhd, a lot of them on eBay don't and are for lhd. The part number of the one I removed from the drivers door is 3D2837016. The passenger side went 2 months later, and got the one above, it looks genuine with the part number laser etched on the side.