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In the Mercedes ML320, the oxygen sensors are typically located in two main areas: upstream (pre-catalytic converter) and downstream (post-catalytic converter) of the exhaust system. The upstream O2 sensors are usually found on the exhaust manifold or close to it, while the downstream sensors are located after the catalytic converter. Accessing them may require raising the vehicle and working underneath, depending on the specific model year. Always refer to the vehicle's service manual for precise locations and procedures.

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