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o2 sensors

Old 06-15-2007, 07:07 PM
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HLB
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Forgive me if I cover things that has been covered before.Where are the o2 sensors
located on a 2000 SSEi and how hard are they to change?
Old 06-15-2007, 07:20 PM
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One before the cat. in the exhaust manifold that determines how much o2 and gas to add to the cylinders. then there is a second behind the cat that only measures how efficient the cat. is being.
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