Ford Focus ST170 cut out and now won't start P1233
Last night my Ford Focus ST170 cut out while driving and now will not start.
It was running fine the journey before which I drove around 10 miles with no problems or hesitations.
At the time it happened I was doing 30mph and it just cut out, I tried bumping it a couple of times while I was free wheeling and it would start but then cut out again.
Luckily I was about 50 yards from my house and could free wheel home. I then tried to start it again a few times and it would start but them immediately die again and you couldn't rev the engine.
After a few times it now won't start. I got my code reader out of the glove box and the last code is P1233.
Can anyone help with this? What should I check first.
Thank you in advanced.