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P0155 GMC -

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what sensor is this p0155 im wonderin if it would have anyting to do with loosin power?
Vehicle: 1999

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P0155 -02 sensor heater circuit malfunction Bank 2 Sensor 1

This is for the upstream 02 sensor  on Bank 2 , the upstream 02 sensor , if the engine is loosing power P0155 can just be the result of the engine loosing power,

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