Hiyas,
Just read the fault code on my 1.4tdci 56 fiesta and its come up with a chassis fault of C140.
I've only been able to find a list of the powertrain faults so dont know what this referrs to.

The problem itself is powerloss at higher rpm 4-6times a day for a second.. I think im narrowing it down to an issue something to do with the alternator system.

Thanks for any help