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On a 2009 Kia Optima, the O2 sensors are located in two main areas: the upstream (pre-catalytic converter) sensor is positioned on the exhaust manifold or just before the catalytic converter, while the downstream (post-catalytic converter) sensor is located after the catalytic converter in the exhaust system. You may need to lift the vehicle for better access, and it's advisable to consult the vehicle's service manual for specific details on location and replacement procedures.

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1mo ago

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