{"nhtsa_id":603643,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-03-01","date":"1998-12-21","document_id":"98254","mfr_campaign":null,"replaces":null,"component":"SUSPENSION:FRONT:SPRINGS:AIR SUSPENSION SYSTEM","mfr_system":null,"summary":"SOME VEHICLES EQUIPPED WITH AIR SUSPENSION MAY EXHIBIT AN INTERMITTENT CHECK SUSPENSION LAMP ON AND DIAGNOSTIC TROUBLE CODE (DTC) C1770 AND/OR C1845 ILLUMINATED. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/603643","components":[{"id":"suspension","name":"Suspension","parent":null},{"id":"air-suspension","name":"Air suspension","parent":"suspension"}],"codes":["C1770","C1845"],"topics":[],"vehicles":[{"make":"FORD","model":"EXPEDITION","year_from":1997,"year_to":1999,"match":"exact","vehicle_ids":["1997_ford_expedition","1998_ford_expedition","1999_ford_expedition"]},{"make":"LINCOLN","model":"NAVIGATOR","year_from":1998,"year_to":1999,"match":"exact","vehicle_ids":["1998_lincoln_navigator","1999_lincoln_navigator"]}],"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":[]}