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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 782 (Engine Control System - DTCS P0451 To P1217) >> P1148, P1168 Closed Loop Control >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC.
DTC DETECTION CONDITION CHART

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 sensor 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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