LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2017 >> QX80 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P1148, P1168: Closed Loop Control >> DTC Logic >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detection Logic

NOTE:

DTC P1148 or P1168 is displayed with DTC for A/F sensor 1.

When the DTC is detected, perform the trouble diagnosis of DTC corresponding to A/F sensor 1.

DTC No. Trouble diagnosis name
(Trouble diagnosis content)		 DTC detecting condition Possible cause
P1148 CLOSED LOOP-B1
[Closed loop control function (bank 1)]		 The closed loop control function for bank 1 does not operate even when vehicle is being driven in the specified condition.
  • Harness or connectors

    (The A/F sensor 1 circuit is open or shorted.)

  • A/F sensor 1
  • A/F sensor 1 heater
P1168 CLOSED LOOP-B2
[Closed loop control function (bank 2)]		 The closed loop control function for bank 2 does not operate even when vehicle is being driven in the specified condition.
scientia non olet · About LEMON Manuals