The Oxygen Sensor ACDelco GM Original Equipment

 AFS98 is a high-quality replacement sensor designed 

specifically for GM vehicles.

The sensor fits a range of years and models, primarily

 in the late 1990s and early 2000s.

Cadillac:

DeVille (1996-1999)

Eldorado (1996-1999)

Seville (1996-1999), including SLS and STS submodels

Chevrolet:

Camaro (1998-2002), including Z28 and Z28 SS submodels

Pontiac:

Firebird (1998-2002), including Formula and Trans Am submodels

This sensor is a GM Original Equipment part, designed 

and tested to rigorous standards for GM vehicles, and is 

typically installed in the exhaust manifold/crossover location

 (downstream). It helps the engine management computer

 adjust the air/fuel ratio for optimal performance and emissions.