Diagnostic Procedure

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

Fig 1: DTC P0135: HO2S Heater Circuit - Bank 1, Sensor 1, DTC P0141: HO2S Heater Circuit - Bank 1, Sensor 2, DTC P0155: HO2S Heater Circuit - Bank 2, Sensor 1 & DTC P0161: HO2S Heater Circuit - Bank 2, Sensor 2 (Steps 1-7)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0135: HO2S Heater Circuit - Bank 1, Sensor 1, DTC P0141: HO2S Heater Circuit - Bank 1, Sensor 2, DTC P0155: HO2S Heater Circuit - Bank 2, Sensor 1 & DTC P0161: HO2S Heater Circuit - Bank 2, Sensor 2 (Steps 8-19)

Courtesy of GENERAL MOTORS CORP.

Fig 3: DTC P0135: HO2S Heater Circuit - Bank 1, Sensor 1, DTC P0141: HO2S Heater Circuit - Bank 1, Sensor 2, DTC P0155: HO2S Heater Circuit - Bank 2, Sensor 1 & DTC P0161: HO2S Heater Circuit - Bank 2, Sensor 2 (Steps 20-23)

Courtesy of GENERAL MOTORS CORP.