Forward Oxygen Sensor Source?
Thanks, Gar You don't need a part number...call him up, and tell him what you need...I bet he rattles off the 8-digit part number without looking at a book. Don't even get Bosch or any other, or you'll hate yourself. Get AC Delco only on this particular part. I think they're about $27 each. He has very reasonable shipping, especially compared to gmpartsdirect.com, and his prices are at least as good if not better. By the way, "Dal" rhymes with "pal". And when it comes to GM parts, he IS your pal!

