{"nhtsa_id":10123886,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-11-17","date":"2013-03-29","document_id":"A011383 2033001-","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:COOLING SYSTEM","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10123886-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10123886-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10123886","components":[{"id":"engine","name":"Engine","parent":null},{"id":"cooling-system","name":"Cooling system","parent":"engine"}],"codes":["P0491","P0492"],"topics":[],"vehicles":[{"make":"AUDI","model":"A4","year_from":2009,"year_to":2010,"match":"exact","vehicle_ids":["2009_audi_a4","2010_audi_a4"]},{"make":"AUDI","model":"A4 AVANT","year_from":2011,"year_to":2011,"match":null,"vehicle_ids":[]},{"make":"AUDI","model":"A6","year_from":2009,"year_to":2011,"match":"exact","vehicle_ids":["2009_audi_a6","2010_audi_a6","2011_audi_a6"]},{"make":"AUDI","model":"Q5","year_from":2009,"year_to":2012,"match":"exact","vehicle_ids":["2009_audi_q5","2010_audi_q5","2011_audi_q5","2012_audi_q5"]},{"make":"AUDI","model":"Q7","year_from":2011,"year_to":2012,"match":"exact","vehicle_ids":["2011_audi_q7","2012_audi_q7"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}