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There are 2 O2 sensors. One is in the front (bank 1) before the catalytic converter, between the exhaust manifold and the catalytic converter, and the other is in the rear (bank 2) after the catalytic converter and is screwed in. The front one is heated and the rear is not. That means after the car begins to heat up the front one comes on and the rear is always on.

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16y ago

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