{"nhtsa_id":620269,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-07-23","date":"2001-03-01","document_id":"13737","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"INOPERATIVE OR INACCURATE SPEEDOMETER AS WELL AS 4X4 LIGHT INOPERATIVE AND / OR DIAGNOSTIC TROUBLE CODE P1635 AND / OR P1639 AFTER A POWERTRAIN CONTROL MODULE (PCM) HAS BEEN REPLACED. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/620269","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["P1635","P1639"],"topics":[],"vehicles":[{"make":"FORD","model":"EXPEDITION","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_ford_expedition","2000_ford_expedition"]},{"make":"FORD","model":"F-150","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_ford_f-150","2000_ford_f-150"]},{"make":"FORD","model":"F-250","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_ford_f-250","2000_ford_f-250"]},{"make":"FORD","model":"MUSTANG","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_ford_mustang","2000_ford_mustang"]},{"make":"LINCOLN","model":"NAVIGATOR","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_lincoln_navigator","2000_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":[]}