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My 2002 4DR LT with 2.5L V6 has 4 O2 sensors: 1 on each side upstream (before each exhaust manifold catalytic converter - "cat"), and 1 on each side downstream (behind each exhaust manifold cat) just behind the flanges on the "Y" pipe that connects the exhaust manifolds/cats to the rear cat. The 3rd/rear cat is located between the "Y" pipe and the muffler on the driver's side and doesn't have any sensor connections.

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Q: Number of and location of oxygen sensors in 2001 Chevrolet tracker v-6 2.5l engine?
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