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Home >> Infiniti >> 2014 >> QX80 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0460 To P1226 >> 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 (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.
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