52.05 22.1 Camshaft and Crankshaft Position Sensors detect camshaft and crankshaft rotation during one engine-combustion cycle. DENSO MRE sensors have a pair of MREs on an Integrated Circuit (IC) chip - this unique design is extremely accurate, even just after an engine is started. The molded IC chip is installed inside a cylindrical magnet so it is positioned closer to the gears that rotate with the cam or crank shaft.