Wont turn ignition off

2008 Ford Mondeo 2.0 tdci titanium x auto estate
Car: Ford Mondeo
Year: 2008
Variant: 2.0 tdci titanium x auto estate
Categories: Running Rough, Starting & Power Loss
When I press the power button the engine stops and ford sign lights up on dash.
Then the ignition comes straight back on. If I then press the brake pedal the ignition goes out but comes back on when brake is released. I cannot lock the car with key fob so have to keep disconnecting the battery and manually lock the car.
sometimes a message on the dash reads mobiliser fault.
Problem added: Dec 29, 2014 (9 years ago)
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