2019 Subaru Forester — Key Fob Programming

Quick reference

Step-by-step on-board programming

DIY on-board programming is not supported on the 2019 Subaru Forester. Both the immobilizer (engine start authorization) and the remote lock/unlock functions must be registered through the vehicle’s Body/Integrated Unit using Subaru diagnostic software (SSM4/SSM). This is a security design to prevent unauthorized key enrollment.

What a dealer/locksmith will do (so you know what to expect):

1. Verify your ID and proof of ownership (required for security access).
2. Identify the correct OEM part number/FCC ID by VIN and by inspecting your existing fob (push-button start vs keyed ignition differ).
3. Connect a Subaru Select Monitor (SSM4) or equivalent locksmith tool to the OBD-II port.
4. Enter immobilizer/keyless registration mode with the proper security credentials.
5. Add a new key/fob: register the transponder ID (for start) and the remote section (for lock/unlock). On smart keys, they will also register proximity functions.
6. If needed, erase missing/lost keys so they can no longer start the car.
7. Cut the emergency/insert blade (smart key) or the full key blade (keyed trims) to your VIN or from your existing key.
8. Test: lock/unlock, passive entry (if equipped), engine start, and verify key count stored in the system.

Because there is no user-accessible programming sequence (like door/ignition cycling), attempting DIY without the correct tool will not work on this model year.

Battery replacement

Battery notes: Avoid touching the new coin cell’s faces with bare fingers (skin oils reduce life). Observe polarity.

Smart key (push-button start, proximity fob — typically CR2032):

1. Slide the small release tab and pull out the mechanical key.
2. Use a plastic pry tool or the key’s tip in the seam to gently split the fob case.
3. Note battery orientation (+ side usually faces up). Remove the CR2032.
4. Install a fresh CR2032, matching polarity.
5. Snap the case halves together and reinsert the mechanical key.
6. Test lock/unlock and, if equipped, proximity entry. If range is weak, re-seat the cell.

Remote-head key (keyed ignition trims — commonly CR1620, verify yours):

1. Remove the small screw or use the notch to separate the remote shell.
2. Lift the battery retainer and remove the coin cell.
3. Install the new battery with correct polarity.
4. Reassemble and test buttons.

Where to buy a replacement fob

• Dealer

  • Pros: Exact part by VIN; latest firmware; full support for programming and warranty.
  • Cons: Highest price.
  • Ballpark: $260–$480 for a remote-head key; $380–$600 for a smart key fob, plus $75–$150 programming and cutting.

• Automotive locksmith

  • Pros: Mobile service; competitive pricing; can cut keys and program on-site; can refurbish OEM fobs.
  • Cons: Availability varies; verify they service 2019+ Subaru and have SSM-capable tools.
  • Ballpark: $180–$400 for remote-head; $250–$450 for smart key, typically inclusive of programming and cutting.

• Online (Amazon/eBay/parts sites)

  • Pros: Lowest part cost; good for spares if you have a cooperating locksmith.
  • Cons: Risk of wrong FCC ID/PN; used fobs may be locked to another car; you still need professional programming and blade cutting.
  • Ballpark: $40–$140 for refurbished OEM or aftermarket shells/fobs (part only).

Tip: Before buying online, open your existing fob and match the FCC ID and internal part labels exactly. Subaru is sensitive to mismatches by trim and market.

If on-board programming isn't supported

• Why: The 2019 Forester uses an encrypted immobilizer and integrated keyless system that requires security access through Subaru SSM software. This prevents adding keys without authorization.
• Transponder: Subaru uses an encrypted immobilizer transponder in 2019 models; exact type varies by trim (remote-head vs smart key) and market. A locksmith can confirm by VIN or by reading your existing key/fob.
• Expected costs: Expect $250–$600 total depending on fob type, how many keys you have, and whether lost-key programming (all keys lost) is required. All-keys-lost jobs usually cost more due to added setup and potential re-seed procedures.
• What you can do: Bring two working keys/fobs if you have them; provide VIN and proof of ownership; decide whether to keep or erase lost fobs.

Lost all keys? A qualified locksmith or dealer can still program a new fob, but plan for tow-in if the vehicle can’t be shifted and you don’t have an emergency blade cut.

Find a mobile locksmith or shop on Repairius.