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In a 2003 Pontiac Montana, the oxygen sensors are located in two main areas: the upstream (pre-cat) sensor is situated in the exhaust manifold or just before the catalytic converter, while the downstream (post-cat) sensor is located after the catalytic converter in the exhaust system. These sensors monitor the oxygen levels in the exhaust gases to help optimize engine performance and emissions. Accessing them may require lifting the vehicle for easier reach.

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3mo ago

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