Specifications: TypeOxygen Sensor Length (Sensor to Lead)450mm,450mm Wires: 4,4 Interchange Part Number: 234-4018,234-4112 Fitments: Please check fitment notes & description for accurate information. for 1997 Buick Century 3.1L for1997 Buick LeSabre 3.8L for1997 Buick Park Avenue 3.8L for1997 Buick Regal 3.8L for1997 Buick Riviera 3.8L for2000-2003Chevrolet Impala 3.8L for1997 Chevrolet Lumina 3.1L for1997 Chevrolet Lumina 3.4L for1997 Chevrolet Monte Carlo 3.1L for1997 Chevrolet Monte Carlo 3.4L for2002-2003 Chevrolet Trailblazer 4.2L for2002-2003 Chevrolet Trailblazer EXT 4.2L for1997 Chevrolet Venture 3.4L for2002-2003 GMC Envoy 4.2L for2002-2003GMC Envoy XL 4.2L for2003 Isuzu Ascender 4.2L for1997Oldsmobile 88 3.8L for2002-2003 Oldsmobile Bravada 4.2L for1997 Oldsmobile LSS 3.8L for1997 Oldsmobile Regency 3.8L for1997 Oldsmobile Silhouette 3.4L for1997 Pontiac Bonneville 3.8L for1997 Pontiac Grand Prix 3.1L for1997 Pontiac Grand Prix 3.8LNote :Before buying, please check the note, color, position, year make model. Please make sure to match the exact part numbers between this part and the part that you are replacing. Contact your mechanics, or send us a message to make sure it matches exactly in case of doubt before purchasing. If one does not match, please do not buy it.Package Includes: 2 pcs Oxygen Sensor Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.