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Home >> Infiniti >> 2008 >> EX35 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0153 >> P0131, P0151 A/F Sensor 1 >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately low.

DTC DETECTING CONDITION AND POSSIBLE CAUSE REFERENCE

DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P0131 Air fuel ratio (A/F) sensor 1 (bank 1) circuit low voltage
  • The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 0V.
  • Harness or connectors

    (The A/F sensor 1 circuit is open or shorted.)

  • A/F sensor 1
P0151 Air fuel ratio (A/F) sensor 1 (bank 2) circuit low voltage
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