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P1133 Diagnostic Trouble Code Discussion for August 2011

Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching

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Trouble Ticket Help Requests for DTC P1133
Help Request Posted
2005 Chevrolet Colorado Sport 3.5L MIL Lamp on VIN: 1GCDT19695
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. ... comes on when cruising down the highway and sets code P1133 (HO2S Insufficient Switching Bank 1 Sensor 1). Tested and replaced B1S1 O2 Sensor. This included testing for bias voltage and verifying sensor ground circuit, 2 days later light is back on. Road t...
August 15, 2011