Wife's 350 4matic had another CEL today.... Recently threw the P0015 (camshaft adjustment magnet) and now it has this P0715 as well. Both codes pulled from AutoZone... The readout says P0715 is Turbine Speed Sensor malfunction.... Has anyone had this happen to them, and what's the most likely diagnosis and fix??? Seems like it's one thing after another with this car now... Any help/advice appreciated.