{"vehicle":{"id":"2009_audi_q5","year":2009,"make":"Audi","model":"Q5"},"code":"P0491","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":3,"bulletins":[{"nhtsa_id":10212656,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-05-31","date":"2012-11-05","document_id":"26 12 15 2026528","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:AIR HANDLER/CHAMBER, DUCTS, AND VALVES","summary":"MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2012/MC-10212656-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2012/MC-10212656-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10212656"},{"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,"component":"ENGINE AND ENGINE COOLING; 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.","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"},{"nhtsa_id":10122864,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-11-08","date":"2012-11-05","document_id":"A261215 2026528-","mfr_campaign":null,"component":"ELECTRICAL SYSTEM","summary":"Supersedes Technical Service Bulletin Group 26 number 12-10 dated March 30, 2012. MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time. Mileage greater than 20,000 miles.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2012/MC-10122864-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2012/MC-10122864-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10122864"}],"url":"https://open.wenmarpro.com/makes/audi/q5/2009/bulletins?code=P0491"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/audi/q5/2009/codes/P0491","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}