2012 Mustang Premium V6 has same issue
I've taken mine in to two Ford dealers and an independent shop. First Ford dealer replaced the front left control arm - didn't solve the problem. Took it to the independent shop and they said "definitely the front left strut needs to be replaced". Second Ford dealership replaced the front strut and pressure plate - neither solved the problem. My Mustang is sitting in a repair bay in Kent, Washington, waiting for Ford to provide possible answers.