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Where is the mass air flow sensor in a 2000 buick lesabre?

The Mass Air Flow (MAF) sensor in a 2000 Buick LeSabre is located in the air intake tube, between the air filter housing and the throttle body. It's usually a small, rectangular sensor with a wire harness plugged into it. You'll likely need to trace the air intake tube from the air filter box to find it.