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P0140 Diagnostic Trouble Code Discussion for June 2004

Heated Oxygen Sensor (Bank 1 Sensor 2) Insufficient Activity

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Trouble Ticket Help Requests for DTC P0140
Help Request Posted
2000 Chevrolet Express 3500 5.7L MIL Lamp on VIN: 1GCHG35R1Y
P0140: Heated Oxygen Sensor (Bank 1 Sensor 2) Insufficient Activity. ... in with a P0140 HO2S B1S2 insufficient activity. I scanned data and found that the sensor was reading 450 mV at all times. I ended up replacing the sensor. Code reset after a few road tests. So I hooked it up to the scope when it was cold and checked for a...
June 17, 2004
1997 Chevrolet K3500 7.4L Excessive Emissions, MIL Lamp on VIN: 1GBJK34J2V
P0140: Heated Oxygen Sensor (Bank 1 Sensor 2) Insufficient Activity. Post o2 sensors were replaced, 4 wire sensors and both are stuck at .438, heater circuits are o.k. tested all o2 sensor wires fron computer to o2 sensor connectors by transfercase, no shorts or opens. suspect an ecm problem. Any help from you GM Techs. Thanks.
June 29, 2004