The fumes are most likely coming from an exhaust leak. The leak could be at the converter, or somewhere else in the exhaust system.
Yes, in a shop maintenance manual specific for that vehicle. Further, An O2 sensor(s) is part of the exhaust system and measures the remaining oxygen existing the engine exhaust as it exists the engine. Using this and a standard of around 20.9 % per volume of air of oxygen going into the intake, it allows the computer to adjust air/fuel mixture or how much gas gets squirted through the injectors. Air volume is measured through a MAP or MAF sensor via flow through the fixed volume of the throttle body which can be varied via the butterfly valve inside it which is actuated by the throttle or "gas pedal." on modern cars there can be two O2 sensors. Start looking at the exhaust manifold and work your way down the exhaust to the back underneath the vehicle. It will be there are wires coming from the exhaust or psrt of the exhaust.
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