Crankshaft Sensor Problem
 

My 2001 Sonata stalled as I was driving and thenshut down completely. I couldn't get it to start again. I had it towed to a mechanic and he told me it was the crankshaft sensor. He said it would cost about $400.00 (parts and labor) to fix it. Is this reasonable for this type of repair? Any advice would be greatly appreciated.