I have checked the codes and it only show one P0455 Evap emission leak. The dealer said this could be a loose fitting gas cap or vacuum leak. I had a mechanic replace the coolant temp sensor and the oil sending unit one week ago and now the car will not run. It will crank up and run for 1 sec and then shut off. I have checked for codes but only the P0455 showes up. Can someone tell me what my problem might be?
 
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