My Focus 1.8 Zetec 1999 has a weird starting problem when the outside temp drops below 5 or 6 celc.
When trying to start nothing happens, won't turn over or anything. What does happen is the immobiliser light on the dash flashes quickly for approx 1min then flashes a code. this code is 15 which apparently means " wrong transponder Key"?
this happens on both keys!
Eventually after about 30 mins of trying it will start and be ok for the rest of the day.
if its a bit warmer it is fine, no problems.
Have tried lots of things from ignition barrel to ecu and Ford are no help at all. Can anyone help please

scomber1975, April 2009