Hi, called the RAC out today after having driven around all morning no probs but motor suddenly failed to start on the way home.

RAC fixed the problem by disconnecting my battery and reconnecting it, but couldn't figure out the root cause and suggested I ask Ford. Thought I'd ask here though first.

It's an mk2.5 08 plate Focus and basically turning the key to ignition 2 doesn't start the engine. The oil and battery lights stay on. Underneath the bonnet there is a buzzing noise. Apparently this should stop after a couple of seconds but intermittently it stays on causing the problem.

RAC wrote on the report:

Non start. Not cranking. Batt volt 12.47. Tested good battery, buzzing noise from engine bay when keys removed. Carried out battery disconnect. Vehicle started fine. Suspect module lock up. Advise to garage for investigation. Oil level on.


Does anyone know what might be causing this? Apparently it could have drained the battery I had replaced a couple of months ago as well but I may have caught it in time this time around...