Hi Tom, Speed yellow Boxster S.....I had the very same problem last year. I was told by a mechanic that it could possibly be the door latch mechanism which is situated inside the door, I ordered the passenger one and fitted it as I reckoned it was this one at fault. once I put it all back together and pressed the fob my heart sunk, problem was still there!, anyway back on to dealership and ordered the drivers side, fitted it and bingo!!!, problem solved
)), my consolation was that I'd renewed both latches for a fraction of the cost of having my nearest dealership, (which is 110 miles from my home) do it, I've had my Boxster five years now and this is the only problem I've had, it's a superb car that's a joy to drive and a complete head turner.