My problem is that when I lock the car, either immediately or whenever it feels like it, the horn will beep in short bursts and the red immobiliser light will be constantly on.
Eventually it will sop and the light will go out enabling me to start the car, but I need to find out what is causing it as its driving me (and neighbours) mad.

It doesn't help that I have a 139db air horn fitted.

Any help much appreciated

may be of help

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- A forum dedicated to the Fiesta Mk7 - 1 year old and going strong!
Info and guides on the Mk3 Fiesta

I like boost! Formerly cookie456_the2nd

Thanks, I read through all of the info on pats but none of the error codes fit with my problem. It is as if the car thinks someone is trying to break in.
Does anybody know where the sensors are (if any) that tell the car if someone is trying to break in.
Could it also be an earth fault?

Thanks

Is it a ford alarm or aftermarket?

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- A forum dedicated to the Fiesta Mk7 - 1 year old and going strong!
Info and guides on the Mk3 Fiesta

I like boost! Formerly cookie456_the2nd

It is a standard ford alarm and immobiliser.

Car was tooting away when unlocked today. I got in and for some strange reason I was able to start the car when the red immobiliser light was on under the clock?

Any ideas on what is causing this.

Thanks

sounds too me like your ford pats system is throwing its toy's out the pram

you might need another, its a small unit that goes around the ignition barrel, check its not fallen off or something, i do have a spare somewhere drop me a pm if you want it