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Home › Infiniti › 2008 › G35 Base › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS U1000 Through P0153 › DTC P0131, P0151: A/F Sensor 1 › DTC Logic › DTC Detection Logic

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 CHART

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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