S2·E11 Used Hearts

Darcy, a successful car dealer, dies after a posh car rolls onto her. She is sent back to correct a fatal error - she sold a car to a young girl, Rebecca, who died after an accident due to mechanical faults.

She gets the chance to meet Rebecca's brother, and learns that they had already lost their parents which makes her more determined to stop the accident as she has already bought the car.

The accident isn't prevented and as Rebecca lies in hospital she has one last chance to talk sense into herself.