Date: Wed, 7 Mar 2001 16:36:38 -0600 From: "Alvin Carter" <al-crtrnopsamspring.com> Subject: O2 Sensor on SAAB I have a 1987 SAAB 9000 Turbo with 180,000 miles. The SAAB mechanics says I need a new O2 Sensor. How do you know when you need one?