Where is the crankshaft sensors location on my 99 silhouette

Hello, those diagnostic trouble codes are not saying that you must replace the sensors. It is saying the sensors noted have lost their signals. This could be because the engine will not start or maybe has stalled. This does not mean the sensors have failed! You are wasting time, money and energy without performing proper testing. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops