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Home >> Infiniti >> 2017 >> QX70 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P1148, P1168: Closed Loop Control >> 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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