The 2014–2026 S-Class uses the same key setup, so everything on this page applies to those years too. The full picture is on the Mercedes-Benz S-Class key guide.

2018 Mercedes-Benz S-Class: key facts

Key type: Smart / proximity key
Push-to-start: Yes
Transponder chip: FBS4 (DAS4)
Programming: Dealer-only (we'll tell you before you spend anything)
All keys lost: We can originate new keys on site

W222 — the first Mercedes designed around FBS4: Mercedes' own fallback-process bulletin (S-B-80.57/62e, hosted at static.nhtsa.gov) lists model 222 as FBS4 for all model years, and Abrites lists the W222 among FBS4 vehicles. Added and replacement keys are effectively dealer-only: VIN-coded keys ordered through Mercedes and enabled with the car present in Xentry. We say so plainly and help with lockouts and diagnosis instead.

Same key system as the 2014–2026 S-Class

Mercedes-Benz kept the S-Class's key system unchanged across 2014–2026, so everything about replacing a 2018 key — blanks, programming, and what happens if every key is lost — matches the rest of that run. The full year-by-year breakdown lives in our Mercedes-Benz S-Class key guide.

For this generation, added or replacement keys go through the dealer — we say that up front rather than charge you to find out. Call (213) 577-1366 and we'll tell you honestly whether a mobile locksmith or the dealer is the right move for your situation.

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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.

Last updated 2026-10-11.

2018 Mercedes-Benz S-Class key replacement

2018 Mercedes-Benz S-Class: key facts

Same key system as the 2014–2026 S-Class

We cover all these cities