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You must have duel exhast then. Bank 1 is the drivers side and you have a upper and lower o2 sensor. More than likely it is the upper o2 sensor that is the problem.
Sure, have your system pressure checked. Worst case scenario, thermostat could be installed upside down or a bad head gasket. Also check for water in the oil or oil in the water. If you don't know how to do this ask at your local parts store.
fuel system too rich #P0172 (bank1) fuel system too rich #P0175 (bank 2) answers from code reader manual I would check fuel regulator and fuel pressure readings
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