{"nhtsa_id":10179079,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-09-01","date":"2020-08-21","document_id":"01-011-20-3734","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Some customers may complain about an unusual noise coming from the engine compartment for about 20 seconds after a cold engine start. This noise is a normal engine operation for improved exhaust gas emissions. The noise does not indicate a malfunction. ACCELERATED WARM-UP SYSTEM (AWS): All SKYACTIV-G engines adopt AWS to reduce exhaust gas emissions immediately after a cold engine start. AWS increases the engine idling speed and retards the ignition timing for about 20 seconds after the cold engine start to quickly warm up the catalytic converter. The customer may identify the engine sound during the AWS operation as a unusual noise.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10179079-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10179079-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10179079","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MAZDA","model":"CX-5","year_from":2013,"year_to":2016,"match":"exact","vehicle_ids":["2013_mazda_cx-5","2014_mazda_cx-5","2015_mazda_cx-5","2016_mazda_cx-5"]},{"make":"MAZDA","model":"MAZDA2","year_from":2016,"year_to":2017,"match":"exact","vehicle_ids":["2016_mazda_mazda2","2017_mazda_mazda2"]},{"make":"MAZDA","model":"MAZDA3","year_from":2012,"year_to":2016,"match":"exact","vehicle_ids":["2012_mazda_mazda3","2013_mazda_mazda3","2014_mazda_mazda3","2015_mazda_mazda3","2016_mazda_mazda3"]},{"make":"MAZDA","model":"MAZDA6","year_from":2014,"year_to":2017,"match":"exact","vehicle_ids":["2014_mazda_mazda6","2015_mazda_mazda6","2016_mazda_mazda6","2017_mazda_mazda6"]}],"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":[]}