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The Oxygen sensor that typically on MOST vehicles is the one closest to the heat of the exhaust. Since the SL2 is a 4 cylinder engine with a single exhaust manifold, check (or replace) the FRONT oxygen sensor, which is in the exhaust manifold, just above the "headpipe". It looks a little like a sparkplug, and should be the only thing in the exhaust manifold that has a wire connected.

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12y ago
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Q: How many o2 sensors on 1995 saturn sc2?
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