Evening , sorry to read about your problem .
From a tech side of things if your battery voltage is low , you will get inconsistent code readings / erroneous readings from sensors . It will also fail to work with canbus system accurately . You need a fully charged battery before you delve into code reading .
It is also possible that if oil has been lost /drained , then the level sensor will record that fact & it may be an inaccurate reading based on this point ( one to fight with ).
Good luck
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To stupidity & beyond
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