I received my part from Auto Reserve without incident. it was what I ordered so have no issues with the service. However when I fitted the part (a rear parking unit) the fault remained. I bought from Auto Reserve as they state all parts are tested, I don't think they would make this claim if it wasn't true so can only assume my fault is elsewhere. I have too many other jobs (not car related) to spend any more time on this fault for the time being. I didn't send the part back because I have no way of knowing whether the part is faulty. When I find out whether the fault was elsewhere or with this unit I will decide whether to use Auto Reserve again.