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P0157 Diagnostic Trouble Code Discussion for March 2021

Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage

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Trouble Ticket Help Requests for DTC P0157
Help Request Posted
1997 GMC C3500 Sierra SL 7.4L Excessive Emissions VIN: 1GDJC34J6V
P0157: Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage. As this is a heavy duty vehicle, it has to pass a tail pipe test in Oregon and failed due to high hydrocarbons. The check engine light was never a problem until they got in line for emissions testing. I verified that it had flat lined and replaced B2S2. I ...
March 17, 2021