LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Engine Control System - Self-Diagnostics) >> Diagnostic Tests >> DTC P0140: Ho2S 2 Circuit Insufficient Activity (Bank 1) >> 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. 2  - HO2S 2 voltage may default to bias voltage. DTC should be cleared and freeze frame/failure records data recorded before proceeding. A normally functioning HO2S 2 voltage signal will fluctuate greater than and less than bias voltage amount. Action in test step should result in a visible reaction from HO2S 2 output.
  2. 4  - A voltage reading other than specified amount in this step indicates an open circuit condition in one of the signal circuits or PCM.
  3. 5  - This step inspects for an open circuit condition in signal circuits, independent of PCM.
  4. 7  - The conditions listed in the table may contribute to failure of HO2S. Conditions listed apply only to this type of failure.
scientia non olet · About LEMON Manuals