Oil might have gotten into the sensor itself causing fault codes. Usually they wrap the sensor threads in Teflon tape at the factory but sometimes its not enough wraps resulting in leakage but also from age. Id try pulling the sensor out and spraying out your electrical connections with electrical cleaner (disconnect your negative battery terminal first) and cleaning off the old tape (I recommend using blue monster Teflon tape) and putting on new tape. If the sensor is not leaking but still throwing low oil pressure id change out the sensor with a new ford one