View Full Version : Where is the location of my Oxygen Sensor?

07-26-2011, 01:50 PM
I have an error code PO141= Definition HO2S-12 (Bank 1 Sensor 2) heater Circuit malfunction. Where would I find that Oxygen Sensor on a 2004 Oldsmobile Silhouette? V6, 3.4L (207 CID) & how to reach it? Thank you.

07-26-2011, 03:52 PM
Hi CalKatKaa,

The downstream O2 sensor is located in the exhaust pipe, after the catalytic converter. It's shown in Haynes manual 38036, Chapter 6, illustration 11.6b.