2017 Subaru Forester Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I get a lot of questions about modern Subaru keys. The 2017 Subaru Forester is an incredibly popular crossover, and unfortunately for the DIY crowd, it represents a strict transition into high-security key systems. Whether your 2017 Forester utilizes a standard turn-key ignition (with an integrated remote) or a Push-to-Start smart proximity key, the days of simple on-board programming are largely over.

Here is everything you need to know about replacing, programming, and maintaining the key fob for your 2017 Subaru Forester.

Quick reference

Step-by-step on-board programming

If you are hoping to program a new key fob for your 2017 Subaru Forester in your driveway using a series of key turns and door button presses, I have bad news: on-board programming is not supported for this vehicle's immobilizer.

While older Subarus (pre-2009) allowed you to program the keyless entry remote via a complicated series of clicks and chimes, the 2017 Forester uses an advanced immobilizer system. The turn-key models use a Subaru "H-Chip" transponder, and the Push-to-Start models use an encrypted proximity system.

To program a new key, a professional must use an advanced diagnostic scan tool (like an Autel IM608, Smart Pro, or Subaru Select Monitor) connected to the vehicle's OBD-II port. The process involves:

1. Connecting the scan tool to the OBD-II port.
2. Bypassing the security gateway and pinging the immobilizer module.
3. Clearing lost keys (if necessary) or adding a new key.
4. Holding the new proximity key to the start button (or turning the physical key in the ignition) while the tool writes the new transponder code to the vehicle's ECU.

Because this requires thousands of dollars in equipment, it is not a DIY job.

Battery replacement

Even if you can't program the fob yourself, you can easily change a dead battery. The 2017 Forester fob uses a standard CR2032 battery.

1. Remove the emergency key: Press the small silver release button on the back of the fob and pull out the metal emergency key blade.
2. Pry the shell apart: Look at the slot where the emergency key just was. Insert a flathead screwdriver (or the tip of the emergency key) into the seam and gently twist to pry the two halves of the fob shell apart.
3. Remove the old battery: Note the orientation of the battery (the positive "+" side should be facing up). Carefully pop it out of its circular housing.
4. Insert the new battery: Snap a fresh CR2032 battery into place, ensuring the positive side is facing up.
5. Reassemble: Snap the two halves of the plastic shell back together and slide the emergency key blade back until it clicks.

Where to buy a replacement fob

When buying a replacement fob, you have three main avenues, each with its own pros and cons:

• The Dealership: The safest but most expensive route. An OEM fob from the dealer will usually run you $150–$250, plus another $100–$150 for cutting and programming. Expect to pay $250 to $400 out the door.
• A Mobile Locksmith: An automotive locksmith can supply an OEM or high-quality aftermarket fob (like ILCO). Because they have lower overhead and come directly to your vehicle, they often charge 20% to 30% less than the dealership. Expect to pay $200 to $300 total for the key, cut, and programming.
• Amazon / Online Retailers: You can find cheap aftermarket fobs online for $20 to $50. Pros: Very cheap upfront cost. Cons: Quality is often a gamble. Many locksmiths will refuse to program a customer-supplied online key because they frequently fail mid-programming or have the wrong internal circuit board.

If on-board programming isn't supported

As established, the 2017 Forester's transponder system strictly requires professional programming. The physical emergency key blade must also be milled using a high-security laser key cutting machine. A standard hardware store key cutter will not work.

When calling around for quotes, be sure to specify whether your Forester is Push-to-Start or a traditional turn-key ignition, as the parts and programming protocols differ slightly. Be prepared to show proof of ownership (registration and ID) before a professional will cut and program a key for you.

Find a mobile locksmith or shop on Repairius.