Fiesta immobiliser

You sure its not the starter motor on the way out?

Does it happen more often at one location?

IOW, do the keys work anywhere?

the early type of immobiliser(PATS)was a saparate small black box that would often burn out. The later type is combined within the PCM im sure yours is the early type,since the problem happens on all keys its unlikely to be a key problem which leaves 3 items..

1)the transceiver ring (around the lock) 2)the wiring going to the module(unlikly since it will restart) 3)the module(located in the footwell)however it will have to be reproggrammed by a dealer for the keys memory

oops forgot to ask when it doe'st start is the PATS light flashing like mad? . if it is then its a pats problem, if the light works normally then it's just a none start check the starter(or the power going to it)as joe said

Thanks everyone for taking the time to reply. When the problem happens the light flashes. It happens everywhere. If I get a tranceiver ring from a scapyard, will it need to be reprogrammed or does the code come from the ECU module? Dave

reprogrammed

No.

The code comes from the Key- the transceiver ring is just an aerial.

Tim..

In message , DC writes

There's a circular aerial around the ignition lock barrel which reads the key chip. It's connected by a small multi-plug. When mine started playing up just like yours, simply unplugging and reconnecting cured it permanently.

Thanks for the suggestions everyone but no joy still. I have changed the tranceiver for a known to be good spare and re-progammed the keys. The problem is still there. Also, dont know if it's linked, the alarm goes off sometimes for no reason. Any ideas or am I looking at the ECU? Dave