Ford Falcon 2014 Problems

It's a common problem when mechanics come to change the plugs at the 100,000 km mark. If it were my car I would be removing the plugs every time it's serviced, and cleaning them and resetting the gap. Not only will that minimize the chances of the plugs being corroded into the alloy head, but also the engine is likely to run better. I also agree with you that it's a flawed design and Ford should cough up for the cost of the repairs.