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Home >> Nissan-Datsun >> 2014 >> Sentra SR >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes & Symptom Tests) >> DTC/Circuit Diagnosis >> DTC P1148: Closed Loop Control >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

NOTE: DTC P1148 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. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause
P1148 CLOSED LOOP-B1 (CLOSED LOOP-B1) The closed loop control function does not operate even when vehicle is being driven in the specified condition.
  • Harness or connectors (A/F sensor 1 circuit is open or shorted.)
  • A/F sensor 1
  • A/F sensor 1 heater