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I have a 92 lumina with a 3.1 and I found the crank sensor to be located on the passenger side of the engine in the back of the engine NOT on the side of the engine below the knock sensor. Hello, in my experience, all O2 sensors are located in the exhaust just after the manifold. It appears easy enough to change. If it is the crank position sensor you are looking for, take a look around the main pulley at the bottom of the engine, you may see a square-ish component located close to the actual pulley wheel, this would be the crank position sensor, it should have wires connected to it.

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โˆ™ 2006-10-22 23:41:03
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Q: Where is the O2 sensor and crank sensor located on a 91 Chevy Lumina 31L and is it fairly simple to replace yourself?
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