A Tracker is a small sport utility vehicle that was sold under the GEO and Chevrolet nameplates from 1989 to 2004. The Chevrolet Equinox took the Trackers place in the 2005 model year. The oxygen sensor on your Tracker makes sure the correct air/fuel ratio is achieved by sending signals to the engines electronic computer module. Your engine will not run at its maximum efficiency if the oxygen
