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Audi

Boost leak testing your Audi

Audi turbo engines don't share one tester, so each kit here is listed by engine and model. The 4.0T kits fit the S6, S7, A8, RS6, RS7 and S8 from 2013 on. They come with PCV and BPV caps, and there are separate versions for 2.5" and 3" SRM inlets. For the B5 S4, RS4, A6 and Allroad with the 2.7T, the twin turbo kits test both turbos at once. There are also testers for the A4 2.0T B7 and B8 with the IHI IS20 turbo (2004 to 2016), the A3 2.0T FSI (2003 to 2008), the TT 225 and the 1.8T. Every kit is billet aluminum with a liquid-filled gauge. To test, fit the tester at the turbo inlet, start at 5 PSI and work up toward your normal boost while you listen for leaks and spray soapy water on every joint. A boost leak is one of the most common causes of a P0299 underboost code on these cars, so test before you replace a turbo or diverter valve.

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