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Home >> Buick >> 2000 >> Century Custom >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0140: Ho2S Bank 1 Sensor 2 Circuit - Insufficient Activity >> Test Description

Test Description

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

The number below refers to the step number in the diagnostic procedures.

  1. 2

    A normally functioning post catalyst HO2S voltage signal will display very little activity. The HO2S 2 voltage parameter should react immediately to the changes in throttle position when performing this test.
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