LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Engine Control System - Self-Diagnostics) >> Drive Cycles >> Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor (Ho2S/O2S) System Set Procedure >> Test Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 1  - Ensure you perform the I/M system check before performing this test. Failure to do so may result in difficulty updating the status to YES.
  2. 2  - Oxygen sensor tests begin during the idle period immediately following the cruise period.
  3. 3  - This step is to identify a first failure of a type "B" DTC. A DTC only appears on the I/M system status display when it becomes a MIL illuminating DTC. This occurs on the second failure of a type "B" DTC. A first failure of a type "B" DTC will not allow I/M system status to update to YES. See DIAGNOSTIC AIDS .
  4. 4  - This step is to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is located in the service information under conditions for running DTC. See CONDITIONS FOR RUNNING .
  5. 5  - I/M system status only reports on whether or not a diagnostic has run, not the outcome of the test. If any emission related DTC sets after tests are complete, DTC will require diagnosis.
scientia non olet · About LEMON Manuals