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How Many O2 Sensors Does A 2000 Chevy Blazer Have?

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Depending on the engine it will have between 4 and 2.

If you had a straight 4 or 6 engine then there would be only 2, one on the exhaust manifold or exhaust pipe and then one just after the catalytic converter.

If you have a "V" engine (V8, V6) then you have an oxygen sensor on each exhaust manifold and will have a catalytic converter for each bank of the V. There will also be an oxygen sensor downstream of each converter as well. In this case there would be 4 oxygen sensors.

There will be

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