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They are before or after your precats depending on year and model. 91-93 have a single O2 sensor in the exhaust manifold, as they have no precats. I believe the 94-95 have 1 sensor before the precat, and one after to monitor the O2 in the exhaust gas. 96+ have 4 O2 sensors. Two before the precats, one on the front, one on the rear, while having two after the precats, on the front bank, and the rear bank. The precats are located after the exhaust manifold, directly before the downpipe.

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