One problem related to frame rust has been reported for the 2002 Subaru Impreza. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Subaru Impreza based on all problems reported for the 2002 Impreza.
My car has a sub frame under the front end. I have read theories about why it is there but it still seems to be a question. I believe the info about it being an additional safety feature for the us market. It can be removed without changing anything else. They rust and mine is a group of rusted frame like material ready to fall and damage the underside of my car and any one behind me. If this is a safety feature it should be recalled and replaced, if is not then there should be an answer about why it is there and is it needed.