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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 P0133, P0153: A/F Sensor 1 >> 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.

To judge the malfunction of A/F sensor 1, this diagnosis measures response time of the A/F signal computed by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or not.

DTC No. Trouble Diagnosis Name DTC Detecting Condition Possible Cause
P0133
0133 (Bank 1)
Air fuel ratio (A/F) sensor 1 circuit slow response
  • The response of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.
  • Harness or connectors (The A/F sensor 1 circuit is open or shorted.)
  • A/F sensor 1
  • A/F sensor 1 heater
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
  • Exhaust gas leaks
  • PCV 
  • Mass air flow sensor
P0153
0153 (Bank 2)