Bmw x3, 2005

recently changed the oil pan gasket. After complete, the SES light is on. OBDII is reporting P0174 only (no P0171), clearing the faults doesn't turn the light or remove the code.

I've checked for air leaks using propane and engine starter, neither turned up anything.

Cleaned the MAF sensor. OBD is reporting 3.15 g/s, 0.4 lb/min at idle.

I'm stumped and can't figure out what might be causing the issue. Any help would be very appreciated.
thanks