Car has 144,000 miles, Value Package VP, std. trans. Regularly maintained at dealer. No extra problems until Feb 2014--had to replace the headgasket. Now the cam sensor needs replaced ($1100)and probably the timing belt also because oil may have gotten on the timing belt--it was replaced at 98,000 miles. It's at the dealer waiting our decision--not able to be driven at all--they will give me $500 for it as is. Are more gaskets, seals, etc., going to fail and cause more serious, expensive repairs?