Hi,
That light not only indicates too less oil. The problem could also be a leak
in your (what's the correct english word?) oil rotation system (?) You might
have enough oil but not enough oil pressure to get it to where it is needed.
BTW: if you read out an error code for a sensor, it doesn't necessarily mean
this sensor is defective. It also indicates, and this is more likely, that
this sensor notifies an error within the system it is watching.

Mark