I just finished replacing all the coil packs and spark plugs on my daughter's 2011 Mercedes C300 4Matic w/110K miles to fix a few misfire codes that came on (P0300, P0305 & P0306). Job was fairly easy and the codes disappeared and the car runs great! At the same time it was due an oil change so I did that too. I change the oil every 3K and use Mobil 1 0W40. There are no check engine lights but now a scan shows a "Permanent Code" P0522 - Engine Oil Pressure Sensor". Being a "Permanent Code" I cannot clear it and see if it comes up again. It is a bit of a coincidence that after changing spark plugs, coil packs and oil change that code shows up? Any ideas of a possible cause and fix. I used a BlueDriver Scanner if that makes a difference. Thanks,Bob K
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