The oil level sensor has been known to thrown false errors when it goes bad, the guy prob just coded it out because he maintained it very regularly (Bav Otto right?) - Also, undervoltage code? Did he do the alternator ever?

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards