Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0140: HO2S Circuit - Insufficient Activity - Bank 1, Sensor 2 & DTC P0160: HO2S Circuit - Insufficient Activity - Bank 2, Sensor 2 (Steps 1-8)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0140: HO2S Circuit - Insufficient Activity - Bank 1, Sensor 2 & DTC P0160: HO2S Circuit - Insufficient Activity - Bank 2, Sensor 2 (Steps 9-17)

Courtesy of GENERAL MOTORS CORP.