Does not get any clearer than this...
https://www.ford.com/support/how-tos...ssis-serviced/
Then at the bottom their is another contact number if you don't get answer you seek.
If you were in Dallas, I have a Innova Reader that can tell you what the Check Engine light is for.
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2019 Sunstar 29ve; Toad Lincoln Navigator; RVi Brake 3 & Command Center; Roadmaster Nighthawk Tow bar & Baseplate; Sumo Springs; Safe T Plus; Onan EC-30 AGS; Vmax 250ah AGM; T-Mobile Internet; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R
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