2015 Ford Fiesta ecoboost key not detected not push button start

[Peter jones]

2015 Ford Fiesta ecoboost

key in ignition,going to start car, no key detected,will start sometimes and not sometimes. Urghhhh help please Thanks

[Tiexen]

What happens with you 2nd key?

[Bobr]

Is there a battery in the key?

[Peter jones]

7 hours ago, Tiexen said:

What happens with you 2nd key?

Same as other key

[Peter jones]

7 hours ago, Bobr said:

Is there a battery in the key?

Yes new in both

[Tiexen]

Did you change the batteries in the key before the problems started or after?

 

[Peter jones]

22 minutes ago, Tiexen said:

Did you change the batteries in the key before the problems started or after?

 

After problem started

[Peter jones]

After problem started

[anon]

I have had this problem with a push button start car recently and it has turned out to be the BCM.

[Peter jones]

This site not much help

key transponder fault 

[st line x 140 driver]

Very hard to diagnose problems with minimal information. Valid solution given at minimal cost of a battery.

Are both keys faulty then or is it the immobiliser.