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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P0031, P0032, P0051, P0052: A/F Sensor 1 Heater >> On Board Diagnosis Logic

On Board Diagnosis Logic

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0031
0031 (Bank 1)
Air fuel ratio (A/F) sensor 1 heater control circuit low The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)
  • Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
  • A/F sensor 1 heater
P0051
0051 (Bank 2)
P0032
0032 (Bank 1)
Air fuel ratio (A/F) sensor 1 heater control circuit high The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)
  • Harness or connectors (The A/F sensor 1 heater circuit is shorted.)
  • A/F sensor 1 heater
P0052
0052 (Bank 2)