MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time
Audi technical service bulletin A011383 2033001- for 2009-2010 Audi A4, 2009-2011 Audi A6 and 2009-2012 Audi Q5 and others.
- Bulletin number
- A011383 2033001-
- Component
- Engine and engine cooling: cooling system
- Summary
- MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time. Mileage is greater than 15,000 miles. Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over time, causing a restriction.
Owners of these vehicles have filed 230 complaints in the engine category.
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