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Home >> Infiniti >> 2006 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Q45 - DTC P0327 Through P1168 >> DTC P1148, P1168 Closed Loop Control >> On Board Diagnosis Logic

On Board Diagnosis Logic

These self-diagnoses have the one trip detection logic  .

DTC DETECTING CONDITION CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1148
1148
(Bank 1)		 Closed loop control function 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
1168
(Bank 2)		 The closed loop control function for bank 2 does not operate even when vehicle is driving in the specified condition.

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

Perform the trouble diagnosis for the corresponding DTC.

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