Ford Mustang 2018–2019 — technical service bulletin
Bulletin TSB 18-2355 · NHTSA communication 10152461 · issued Nov 28, 2018
Technical service bulletin
communication type
Engine and Engine Cooling
component
2018–2019
model years
2
vehicle entries
Official summary
Some 2018-2019 Mustang vehicles built on or before 17-Oct-2018 and equipped with a 2.3L engine may exhibit an illuminated MIL with DTC P0420. Follow the Service Procedure steps to correct the condition.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.