Audi TSB #A011383 2033001-
2011 Audi Q7
Affected Component: ENGINE AND ENGINE COOLING:COOLING SYSTEM
- 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.