Home >> BMW >> 2012 >> 760Li >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N74 - Diagnostic Trouble Codes - DTC P1638 (BMW DTC 100001) Through DTC P140E (BMW DTC 110008) >> DTC P02A7; BMW DTC 10F401: Cylinder equalization above lambda, cylinder 4: cylinder-selective oxygen-sensor control, lower limit reached >> Service instruction