Mazda BT-50 P0191:  Fuel Rail Pressure Sensor → Circuit “A”→ Range/Performance

  P0191 is a common OBD-II code.  It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range.  This is a generic code, which indicates that it has the same meaning for the Mazda BT-50 as it would any other vehicle.     P0191 is typically caused ... Read more Mazda BT-50 P0191:  Fuel Rail Pressure Sensor → Circuit “A” → Range/Performance