It's not big enough to be a minivan, but the Mazda5 could still catch fire unexpectedly. (C'mon, that's non sequiturs 101.) The company announced an exhaust system flaw on 2,700 new Mazda5 models that could cause fires. No injuries have been reported, but Mazda5 owners are urged to contact a dealer to get the flaw corrected. The loaner car's on Mazda's dime.