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I was searching the other day for some good pics of the C5 precat O2 sensors, location and where they attach to determine difficulty of replacement. I could not find any, so I located some.
Pretty easy job to do, just need an oxygen sensor wrench (amazon or whatever), put the car up on jack stands and they clip right in and out. Took me about 45 min the first time I did it.
C5 O2 sensor pictures
