{"nhtsa_id":10159504,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-05-07","date":"2019-04-04","document_id":"SSM 47911","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"SSM 47911 - 2018-2019 F-150/Mustang - 5.0L - Chirping Noise From Engine Compartment At Idle Some 2018-2019 F-150 and Mustang vehicles equipped with a 5.0L engine may exhibit a chirping type noise from the upper right side of the engine at a warm or hot idle. This noise may sound similar to a front engine accessory drive (FEAD) chirp noise. If the noise persists with the FEAD belt removed and is isolated to the front cover area, this noise may be due to the primary timing chain tensioner. This noise will not result in any engine durability concerns. Do not attempt any repairs at this time. Engineering is investigating, monitor OASIS for updates.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10159504-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10159504-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10159504","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"F-150","year_from":2018,"year_to":2019,"match":"exact","vehicle_ids":["2018_ford_f-150","2019_ford_f-150"]},{"make":"FORD","model":"MUSTANG","year_from":2018,"year_to":2019,"match":"exact","vehicle_ids":["2018_ford_mustang","2019_ford_mustang"]}],"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":[]}