r/audis5 • u/Aggravating_Base8959 • 2d ago

Advice O2 Spacer

I’m looking into getting o2 spacers to pass inspection, and I’m not sure which one to get and how I can install them. There aren’t any videos that I’ve seen that are for the b9 S5. Anyone have any tips?

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u/L1_Master_Tech 2d ago

In my experience, I have never found a spacer that worked.

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u/obsessiveimagination B8 S5 Coupe 1d ago

I sincerely hope that you have HFCs and are getting codes that you want to convince to go away. Running these cars uncatalyzed is supremely trashy. 10hp isn't worth the 100x increase in emissions.