My 2007 S MAX has previously had a shoddy repair to a front end smash, it looks like an incorrect bumper has been fitted which looks ok but does not have the two parking sensors fitted. The rear 4 are present but the system does not work, i.e. on engaging reverse I get the 3 second tone and flashing light in the switch. So am wondering if the system can be made to function using the rear sensors only or if not, where can I buy two new front sensors ( part number?) without going to Ford?

If I do get two replacements I'm not yet sure if the wiring is present for them, if not where is the parking sensor box located please?

Thanks

I've since ordered a set of 4 new front sensors with mounting kit and hardware, problem is I can't see where the inner two are located, looking at photos of other titaniums the outer two are obvious but where do the inner two mount?