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Downstream O2S Shorted To Voltage
Bank 1 HO2S 2 Heater Circuit Malfunction
Both of the codes indicate a failure of the downstream O2 sensor or the one behind the converter assuming only one converter on your truck.If your truck has two converters one on each side of the engine it will be the sensor behind the converter on the side that #1 cylinder is on.Being that both are electrical failures of the sensor I would probably just put a new one in and not bother checking the system except to maybe trace the wiring for obvious cuts or others signs of damage.In the future when you see a "P" code it means it is a powertrain code.