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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 292 (Engine Control System - DTCS P1550 To P2A03) >> DTC P2A00, P2A03: A/F Sensor 1 >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2012 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored so it will not shift to LEAN side or RICH side.

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P2A00 A/F SENSOR1 (B1)
(Air fuel ratio (A/F) sensor 1 (bank 1) circuit range/performance)
  • The output voltage computed by ECM from the A/F sensor 1 signal shifts to the lean side for a specified period.
  • The A/F signal computed by ECM from the A/F sensor 1 signal shifts to the rich side for a specified period.
  • A/F sensor 1
  • A/F sensor 1 heater
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
  • Heated oxygen sensor 2
  • Exhaust gas leak
P2A03 A/F SENSOR1 (B2)
(Air fuel ratio (A/F) sensor 1 (bank 2) circuit range/performance)
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