SSM 50432 2011-2021 Ford Ranger – Repeat Spark Plug Replacements

Technical Service Bulletin

SSM 50432   2011-2021 Various Vehicles – Repeat Spark Plug Replacements

When replacing spark plugs, all spark plug boots should be inspected for signs of arcing or carbon deposits. The boot cannot be cleaned and must be replaced. Failure to do so may result in repeat replacement of the spark plug caused by arcing. Refer to Workshop Manual (WSM) Section, 303-00 (Spark Plug Inspection). For 2018 and older vehicles, refer to 2019 and newer Workshop Manual for Spark Plug Inspection procedure. When installing, refer to the Spark Plug Removal and Installation procedure found in WSM Section, 303-07 to prevent wrench breaking from side loading. A tilted or poorly seated socket can cause tool slip and fracture the ceramic insulator of the spark plug.