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Audi TSB #A011383 2033001-
2009 Audi A4
TSB Document:
Affected 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.
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