Ford focus zetec 2001/ crank shaft?

I have a ford focus zetec 2001, it's just had MOT done and they had to replace the crank shaft, I was told that because it had been replaced it would probably only last a week but could last longer, I just wondered if anyone else had had this problem as I'm scared to use the car now, Tia

Added (1). Sorry crank shaft sensor

There's no reason why a replacement sensor should not last as long as the original if they have done the work correctly.

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