Had this before..

knocked the bottom of my focus on some raise bit on way to work.
engine warning light came on. took it to for.. it was a sensor in the
exhaust that had taken the impact. he said its nothing major but a new
sensor..?250. ok.. same bit of road done it again.. should forward my
bills to the councill. already done 4 tyres in the past year due to
pot holes. anyway

is there anything i can do rather rather than taking to a garage.. my
old man is a ?old school? mechanic and im more electrical..

any advice would be great