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have codes po141 and po036
Vehicle: 2011 Chev. Silverado, 1500, 4.3 L, V 6

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P0141 H02S heater performance Bank 1 Sensor 2

P0036 Heater control circuit Bank 1 Sensor 2

Bank 1 is where cylinder 1 is located , being Sensor 2 this is the catalytic monitor 02 sensor , which is downstream 02 sensor, the location in this diagram is number 4

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