check engine light stays on.havecodes poo16 and poo73. on 2008 Mazda Mazda6

camshaft sensor,crankshaft sensor replaced these code,erase ,reset computer. light stayed off 2hrs. and came on again,HELP@! I NEED AN INSPECTON STICKER A.S.A.P

Asked by for the 2008 Mazda Mazda6
Find out WHY computer says these parts need to be checked.
Circuit check,a code does not mean that sensor is causing problem.
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