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In a Hyundai Accent, there are two oxygen sensors - one located before the catalytic converter and the other after it. The first sensor is positioned between the rear of the engine and the exhaust manifold, while the second one is in the tailpipe immediately following the converter. Accessing the upstream sensor is simpler; just open the hood, remove the engine cover, and look above to locate the sensor at the center of the exhaust manifold. The upstream sensor monitors exhaust gases as they exit the engine, while the downstream sensor tracks the gases post-converter. The car's computer uses data from these sensors to adjust the air-fuel ratio, thus aiding in emission control for cleaner air.
The oxygen sensor for the Hyundai Accent can be found on the exhaust system, both before and after the catalytic converter.
Benjamin B, I'm glad I could be of assistance. Let me know if you need further help!