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Home >> Infiniti >> 2016 >> QX50 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System Diagnostic Trouble Codes (DTCS) (P0447-P2138) >> DTC/Circuit Diagnosis >> DTC P1148, P1168: Closed Loop Control Function >> DTC Logic >> DTC Detection Logic
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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 DTC detecting condition Possible cause
P1148 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 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.
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