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Home >> Infiniti >> 2008 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0308 >> DTC P0131, P0151: A/F Sensor 1 >> On Board Diagnosis Logic

On Board Diagnosis 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
0131 (Bank 1)		 Air fuel ratio (A/F) sensor 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.)
  • Air fuel ratio (A/F) sensor 1
P0151
0151 (Bank 2)
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