Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over...
Audi technical service bulletin 149020354543 for 2009-2012 Audi A6, 2009-2012 Audi Q5 and 2011-2012 Audi Q7 and others.
- Bulletin number
- 149020354543
- Component
- Power train
- Summary
- Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over time, causing a restriction. The ODIS tester can identify the state of the restriction, and will request that the system is cleaned in order to prevent the MIL from illuminating.
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