Stalling has taken place while idling and driving.Have replaced timing belt, serpentine belts, and alternator twice. Some friends have suggested idle control valve, others camshaft or crankshaft sensors. Wouldn't these problems have dashboard lights? how much would it cost to replace?
2003 sonata stalls intermittently, no engine lights lit, wont do it at shop. on 2003 Hyundai Sonata
by cinderellaman in Naperville, IL on August 28, 2011
ANSWER by RPBrooksbank , May 12, 2012
Same thing happened with mine. It was the crankshaft sensor. It didn't cause a code to be stored so no engine light. It's not difficult to replace just time consuming as you have to take off the power steering pump mount, the timing belt cover (requires taking the crankshaft and water pump pulley off) and the timing belt. Make sure everything is TDC before you remove the belt then don't move the crankshaft or camshafts until you put it back on. (might be a good time to go ahead and replace the belt while you have it off). The sensor cost about $75.