I bought a 2007 2.5T Mondeo Estate Titanium X last week and a couple of days after there was a message on the dash saying "Alarm System Service Reqd". I've searched and found other people saying there is a battery backup sensor or backup alarm under the FNS wheelarch which gets wet and causes this error. The message only showed the once - has not been seen since. The weather has been lovely of course and I'm yet to wash it so there's been no water near the car.
I have a 3 month warranty with the garage where I purchased the car, however this warranty is with them only, so I have to drive 70 miles each way leaving wife and kids without car (school run etc) plus the time off work, so it's a pain to say the least. I plugged in my ELM327 to the OBD2 port to see if there were any fault codes, but none were reported.
What I'd like to know is your opinions the following:
Would a proper Ford diagnostics device pick up on the alarm error when my ELM327 would not? If someone knows for sure that the dealer's equipment will find no errors if I can't find any then that makes my trip less worthwhile.
If the message shows once, is it likely to return and eventually cause (expensive) problems?
Any further advice on this error message?
The difficult thing is, the warranty expires just before Christmas, so I've not got long to sort out any problems that arise. I suspect diagnosing and replacing these alarm components could be a bit pricey, so don't want to leave it, however if it weren't for the warranty I'd currently be simply keeping an eye on the messages to see whether it comes up again rather than taking it in to be checked over.
Thanks in advance.