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Home >> Infiniti >> 2012 >> EX35 Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0443 Through P1212 >> DTC P1148, P1168: Closed Loop Control >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

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 driving 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 driving in the specified condition.
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