Difficult steering in BMW’s 2004-2005 Mini Cooper has lead the National Highway Traffic Safety Administration (NHTSA) to upgrade its investigation to include almost 60,000 vehicles. The investigation began last fall with over 500 complaints filed with the NHTSA, and 4,500 warranty claims with BMW. Among the complaints were allegations of five minor crashes, three of which resulted in a fire. The suspect part is a malfunctioning cooling fan which causes an under voltage condition in the power steering electrical system. Drivers have complained about loss of power assist making it difficult to maneuver the vehicle, and the inability to restart the vehicle because of a drained battery. If the investigation leads to a recall, over 200,000 Minis built between 2001-2007 could be involved.