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Store Home Hot Seller New Arrival Contact us 2Piece Upstream & Downstream Oxygen Sensor Note: For clarification purposes Upstream Location is between the catalytic converter and the engineDownstream Location is between the catalytic converter and the tailpipe Fitment For 1997-2000 Buick Century V6 3.1L - Upstream & DownstreamFor 1997-2003 Buick LeSabre V6 3.8L - Upstream & DownstreamFor 1997-2003 Buick Park Avenue V6 3.8L - Upstream & DownstreamFor 1997-2003 Buick Regal V6 3.8L - Upstream & Down...

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