2017 Mercedes-Benz Metris — Key Fob Programming

Quick reference

Item	Detail
FCC ID	Verify on your existing key’s label; multiple FCC IDs were used on W447 Metris. Do not assume—match by VIN/label.
OEM Fob PN	Varies by VIN and option set; dealer can confirm the correct Mercedes part number from your VIN.
Aftermarket Options	Refurbished OEM fobs and locksmith‑grade aftermarket remotes exist; quality varies. Universal remotes (e.g., locksmith tools) require pro programming.
Battery Type	Typically CR2032 coin cell (verify by opening your fob).
Programmable On-Board?	No. Mercedes FBS immobilizer (FBS3/FBS4 depending on build) requires dealer/locksmith equipment.
Cuts Required?	Yes. The flip/insert blade is a laser-cut (sidewinder) key and must be cut to your vehicle.

Step-by-step on-board programming

There is no DIY on-board programming procedure for the 2017 Mercedes-Benz Metris. The vehicle uses Mercedes’ FBS immobilizer system (model-year 2017 commonly FBS3 on North American W447), which employs rolling crypto and key tracks stored in the Electronic Ignition Switch (EIS). Adding a key requires specialized equipment and, in many cases, online authorization. Here’s what the process looks like with a professional:

1. Gather documents

• You will need the VIN and proof of ownership (photo ID and registration/title). Dealers and most legitimate locksmiths must verify this before cutting or programming a key.

2. Select the correct key/fob

• The correct FCC ID and Mercedes part number are matched by VIN. A dealer can order a precoded OEM key from Mercedes. A qualified automotive locksmith may supply an OEM/refurbished OEM or an approved aftermarket remote and precode it using locksmith tooling.

3. Cut the mechanical blade

• The flip/insert blade is a sidewinder (laser-cut) profile. It’s cut by code from your VIN or by decoding an existing key. Cutting accuracy matters for door/ignition operation and emergency entry.

4. Program/add the key to the vehicle

• The pro connects Mercedes Xentry/DAS or locksmith-grade MB tools to the OBD port, reads the EIS, allocates an unused key track, and writes/authorizes the new key. This step synchronizes the immobilizer transponder; the remote lock/unlock typically pairs automatically as part of the same process.

5. Verify all functions

• Test lock/unlock, panic (if equipped), key rotation/starting, and that existing keys still start the engine. On some vehicles, previously lost keys can be disabled during this visit.

Why no DIY? The FBS system’s cryptography and key slot allocation aren’t accessible by any ignition or pedal sequence. Without manufacturer-authorized or equivalent locksmith tools, a new key cannot be learned.

Battery replacement

Most 2017 Metris flip fobs use a single CR2032 coin cell. To replace it safely:

1. Remove the mechanical key blade

• Press the release button and flip/remove the blade as designed. On many units, this exposes or loosens the battery cover.

2. Open the battery compartment

• Look for a small notch along the seam. Use a plastic pry tool or fingernail to separate the cover. Avoid metal tools that can mar the case.

3. Swap the cell

• Note polarity before removal. Install a fresh CR2032 with the same orientation. Avoid touching the new battery’s faces with bare fingers—skin oils can shorten life.

4. Reassemble and test

• Snap the cover back, insert the blade, and test lock/unlock within a few feet of the van. If range is poor, double-check polarity and the seating of the cell.

Where to buy a replacement fob

• Mercedes-Benz dealer

  • Pros: Guaranteed correct part number by VIN; high success rate; warranty.
  • Cons: Highest price; typically requires in-person visit and ID.
  • Ballpark: $350–$550 for a programmed remote key, including cutting and coding.

• Automotive locksmith (mobile or shop)

  • Pros: Often cheaper than dealer; mobile service available; faster turnaround; can disable lost keys.
  • Cons: Quality varies—choose a pro with Mercedes capability. Parts may be refurbished OEM or vetted aftermarket.
  • Ballpark: $250–$450 programmed, including cutting.

• Online retailers (Amazon/eBay)

  • Pros: Lowest part cost; convenient.
  • Cons: You still need professional cutting/programming; wrong FCC ID/part can’t be programmed; many listings are shells-only or used boards.
  • Ballpark: $30–$120 for a bare fob/shell; $150–$250 for locksmith-grade aftermarket—programming and cutting extra.

Tip: Never buy a used Mercedes key expecting it to be reused—most are locked to the original vehicle. Pros can sometimes transfer boards/shells, but the transponder identity cannot be “reset.”

If on-board programming isn't supported

Expect to pay for professional programming because the immobilizer transponder is part of Mercedes’ FBS system (FBS3/FBS4) and must be precoded and authorized to your EIS. There is no pedal/ignition sequence to learn a key, and generic OBD scanners cannot add keys.

• Lost all keys: Budget $350–$700 depending on provider and whether towing is needed. Many locksmiths can do this mobile and save a tow.
• Spare key (you still have one working): Usually faster and cheaper—often $250–$450.
• Immobilizer notes: The transponder is embedded in the fob’s electronics; it is not a simple cloneable ID46 chip. The mechanical blade is only for physical access/ignition rotation and must still be accurately laser-cut.

Need help now? Find a mobile locksmith or shop on Repairius.