Subaru Key Types by Year: Which Key Your Subaru Actually Takes

Subaru has used three key families on the cars still on the road: its own 4D62 and 4D65 transponders from about 2004 to 2014, HITAG-2 transponders from about 2015, and Push-Button-Start proximity keys on upper trims from roughly 2017. As of September 2026, a spare runs $175 to $325 depending on which you have, and a Push-Button-Start car with every key lost runs $325 to $420. The one wrinkle unique to Subaru is a module called the BIU, which on some 2020-or-newer cars can turn an all-keys-lost into a dealer visit.

Subaru's sales are concentrated in a handful of models, the Outback, Forester, Crosstrek and Ascent, and they are disproportionately popular in the Pacific Northwest and the Northeast. That means a lot of Subaru owners live in the colder, more rural parts of the states we cover, which is exactly where knowing your key type before you call saves a wasted trip. This guide explains the three generations, where the common models land, how to identify yours in a few seconds, and when the dealer is genuinely the right call.

The three generations at a glance

These bands come from our Subaru make page and are total on-site prices.

Key type	Roughly	How you start the car	Spare, working key present	All keys lost
4D62 / 4D65 transponder	2004 – 2014	Insert and turn	$175 – $245	quoted per vehicle
HITAG-2 transponder	2015 onward, key-start trims	Insert and turn	$195 – $275	quoted per vehicle
HITAG-2 Push-Button-Start proximity	2017 onward, upper trims	Fob in pocket, press start	$245 – $325	$325 – $420
BIU security lock after all keys lost	some 2020+ vehicles	—	not applicable	dealer re-flash first

The years overlap on purpose. Subaru did not switch every model in the same year, and within a single model year a base trim and a Touring trim can carry different keys. That is why the VIN, not the model name, is the reliable answer. The all-keys-lost cells for the transponder generations are left unquoted because those jobs are priced per vehicle rather than from a standing band.

4D62 and 4D65: roughly 2004 to 2014

Subaru shipped its first transponder immobilizer around 2004 using a Subaru-specific variant of the Texas Instruments 4D chip. Early Outback and Forester models used the 4D62; roughly 2009 to 2014 models moved to the 4D65.

These are straightforward keys. The factory Subaru software handles them, and so do the mainstream aftermarket tools most automotive specialists carry, including the Autel IM608, Smart Pro and JMA TRS-5000. A 2014 Outback 4D62 spare runs $175 to $245, which is the example the make page uses.

The one thing to get right is the blank. A generic 4D chip can look identical to the Subaru variant and simply will not program. A specialist who works on Subarus regularly carries the right blanks; one who does not may have to order them, which is where a delay comes from.

If your Subaru from this era has high mileage, also consider the cylinder. On older cars a key that turns sometimes and not others is usually worn wafers in the ignition rather than a failing chip. Our guide to a key that will not turn in the ignition explains the difference.

HITAG-2 transponders: roughly 2015 onward

From about 2015, Subaru moved to the NXP HITAG-2 transponder on its key-start cars, starting with the Outback and Forester. For the owner, the key looks and behaves much the same: a bladed key, often with the remote built into the head, inserted and turned to start.

The change matters on the tool side. HITAG-2 is programmed differently from the older 4D family, and a HITAG-2 spare runs $195 to $275. It is still routine work for any specialist with a current Subaru licence on their tool, and there is no PIN or security credential in the way.

Push-Button-Start proximity: roughly 2017 onward

From about 2017, Subaru's Limited and Touring trims moved to Push-Button-Start, Subaru's name for its proximity key system. The fob stays in your pocket or bag, the car unlocks as you touch the handle, and you press a button to start. Underneath it is still HITAG-2, paired with the body electronics and a gateway.

A Push-Button-Start spare with a working key present runs $245 to $325. All keys lost runs $325 to $420, the example on the make page being a 2024 Outback Touring XT. The price difference between the two is procedure: with a working key present, the car already trusts something and can be told to accept one more; with every key gone, it has to be persuaded from nothing.

Because these keys run on a coin cell, the most common false alarm on a Push-Button-Start Subaru is a flat battery, which shows up first as shrinking range and then as unreliable hands-free entry. If your door handle has stopped responding, our guide to a smart key in your pocket that will not unlock the door walks through the checks before you pay for anything.

The BIU: the Subaru-specific catch

The Body Integrated Unit, or BIU, manages Subaru's body electronics, including recognising keys. On some 2020-or-newer Outback, Forester and Ascent vehicles, an all-keys-lost event can leave the BIU in a security-locked state.

When that happens, an aftermarket specialist can still program new keys, but the BIU has to be cleared first, and that requires Subaru's SSM-IV factory tool with dealer-level connectivity. In practice that means a trip to a Subaru dealer for the re-flash before the key job can be finished, typically a one-to-two-day round trip.

Two things are worth knowing. First, it is uncommon; most all-keys-lost jobs on these cars finish on-site. Second, a specialist who knows Subarus will flag the risk at intake rather than after arriving, so you are not surprised. It is also the strongest argument on this make for adding a spare while you still have one working key: a spare job never triggers the BIU lock.

Where the common Subarus land

• Outback. The best-selling Subaru and the widest spread of key types. Early cars carry 4D62, 2009 to 2014 cars 4D65, key-start cars from about 2015 HITAG-2, and Limited and Touring trims from about 2017 Push-Button-Start. The 2025-and-newer refresh continues HITAG-2 Push-Button-Start.
• Forester. Follows the Outback closely: 4D-family transponders on older cars, HITAG-2 later, Push-Button-Start on upper trims. The 2025-and-newer generation, including the hybrid, uses HITAG-2.
• Crosstrek. Built from 2013; its third generation from 2024 is an all-new design. Base trims tend to be key-start, upper trims Push-Button-Start.
• Impreza. Shares its platform with the Crosstrek, with the same trim-dependent split.
• Ascent. The three-row SUV, built from 2019, with HITAG-2 Push-Button-Start standard. It is one of the models where the BIU lock can apply on all keys lost.
• WRX. The performance variant shares its key family with the Impreza of the same era.
• Legacy. Discontinued after the 2025 model year; the final generation uses HITAG-2.
• BRZ. Shares its platform with the Toyota GR86 and uses Toyota's DST80 and DST-AES key families. Treat it as a Toyota; our Toyota key types guide covers it.
• Solterra. A Toyota-derived electric vehicle. Again, the Toyota guide is the relevant one.

If your model is not listed, or it sits on a boundary year, the specialist confirms the key family from the VIN before anyone is dispatched.

Identifying yours in ten seconds

1. Look at how you start the car. A key you turn means a transponder generation. A start button means Push-Button-Start.
2. Check the year. Before about 2015 on a key-start car points to the 4D family. From about 2015 on a key-start car points to HITAG-2.
3. Check the trim. Limited, Touring and similar upper trims from about 2017 are the ones most likely to be Push-Button-Start, even when the base model of the same year is key-start.
4. Check for a Toyota badge in the family. BRZ and Solterra follow Toyota rather than Subaru.

That is enough for a specialist to give you a price range on the phone. The VIN then confirms it before the visit. Our guide to what the VIN changes about your quote explains why a good specialist asks for it early.

Subaru compared with the other Japanese makes

Because this site is built around comparisons, here is how Subaru sits beside its neighbours, using the bands from each make page and our proximity key page.

Make	Transponder spare	Proximity spare	Main complication
Subaru	$175 – $275	$245 – $325	BIU lock on some 2020+ all-keys-lost
Toyota / Lexus Smart Key	see Toyota guide	$280 – $420	Truck H chip needs a dedicated cable
Honda / Acura Smart Entry	see Honda guide	$300 – $450	Generation-dependent programming
Nissan	see Nissan guide	see Nissan guide	BCM PIN on all keys lost

Subaru is among the least complicated makes to key, with one notable exception. The Toyota, Honda and Nissan equivalents are covered in our Toyota key types and Honda key types guides and our Nissan cost guide.

What the visit actually looks like

These windows come from our Subaru make page.

• Spare with a working key present: 20 to 40 minutes.
• All keys lost: 60 to 90 minutes.
• All keys lost where the BIU has locked: the specialist programs keys after a Subaru dealer re-flash, adding roughly a one-to-two-day round trip.

Have your registration and a matching photo ID in the car, because a legitimate specialist verifies ownership before programming a key.

Dealer versus mobile on the same Subaru

For most Subarus the mobile route is the lower total cost, and on an all-keys-lost it saves a tow as well. The dealer is genuinely the right call in three cases, all listed on our make page:

• The BIU needs a re-flash. Only Subaru's SSM-IV with dealer connectivity can clear it.
• There is an open recall on EyeSight or the BIU. Check the VIN against the NHTSA recall database; a recall remedy is free at the dealer.
• You hold a Subaru Added Security extended warranty that covers the fault.

Before you assume you need a key

• Replace the fob battery on a Push-Button-Start car before anything else.
• Try the spare key. If the spare works and your usual key does not, the fault is that key, and on a cracked or worn fob a new shell may be enough; our guide to a key fob that is falling apart explains when.
• Think about cold. A borderline battery often fails on the first cold morning, which is common Subaru territory. Our guide to car key problems in cold weather covers it.

Getting an accurate Subaru quote

Tell whoever you call the year, model and trim, whether you turn a key or press a button, and whether any working key exists. Those three facts are enough for an accurate range, and the VIN confirms it. We match Subaru owners with specialists across 15 states, including Washington, New York, Pennsylvania and New Jersey. Start at get help, or read how it works first.