Oil can sometimes mean fuel (lost in translation). Just looked up the code.
Generic OBD Error Code Details for P0251

Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector)

What does this mean?

OBD Code P0251refers to
The ECM detects a discrepancy between the Pulse-Width Modulation (PWM) supplied to the Electronic Fuel Control Actuator (FCA) and the PWM returned from the Electronic Fuel Control Actuator (FCA).
Symptoms

Possible sumptoms of OBD code P0251
- Engine Light ON (or Service Engine Soon Warning Light)
Causes

Possible causes of OBD code P0251
- Fuel Pump - FCA Driver Open - Return Circuit Open from FCA to ECM - FCA Driver Circuit Shorted to External Voltage - FCA Return Circuit Shorted to External V
HTH
Fiachra