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White Diamond '03 DHS (with DTS floor shift)
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3 of the 4 are pretty easy to get at. The tough one is the one on the rear manifold.
 

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1997stsowner said:
I have a 1997 STS. Is it difficult to replace the oxygen sensors?
Thanks
Are you getting a code for an O2 sensor? There are 4 of them as Ranger mentioned. They are labeled as follows:

Bank 1 Sensor 1: In the exhaust manifold for the rear bank of cylinders
Bank 1 Sensor 2: Just before (in front of) the catalytic converter
Bank 1 Sensor 3: Just after (behind) the catalytic converter
Bank 2 Sensor 1: In the exhaust manifold for the front cylinder bank

The B1S1 and B2S1 sensors use one part number and the B1S2 and B1S3 sensors use a different part number. The wire harnesses are different between the two. AC-Delco sensors are recommended replacements - some have had problems with Bosch sensors. Don't bother with the "universal" type sensors. They require wire splicing and that's not usually a good idea when dealing with a low voltage low current connection like that where accuracy is imiportant.
 
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