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2005 GMC Sierra 5.3L with code P0135

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2005 GMC Sierra 5.3L with code P0135. Where on the engine is this o2 sensor?

Vehicle: 2005 GMC Sierra 5.3L

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P0135 H02S Heater Performance Bank 1 Sensor 1

Bank 1 is where cylinder number 1 is located, Sensor 1 are engine management sensor.This is also known as upstream sensor

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