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i have these 3 codes pop up. can someone help me with this i know i have a bad O2 sensor but can someone explain this to me please. thank you

P0135 - O2 sensor heater circuit (bank 1, sensor 1)
P0134 - 02 sensor circuit (bank 1, sensor 1) open
P0313 Misfire Detected with Low Fuel
 

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The oxygen sensor closest to the fron of the car is either disconnected or dead.
 
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