Subaru Legacy Outback 2020- AKL by SSM4, IM608 or OBDSTAR?

What programming tool supports Subaru Outback 2021 all keys lost? Abrites and Smart Pro don’t support it. What about Autel and SSM4?


Thee smart system in modern Subaru is derived from the Toyota Denso systems, you cannot add a key to this vehicle without a valid, working key even with security access to the diagnostic tool.

The earlier pre 2020 vehicles there are ways around this, but Outback in 2020 was updated to a new platform.

If you have no valid keys for this vehicle you must follow the OEM procedure which includes replacement of several parts and then you will need the auth key to perform the registrations for the car to start. 8-bit auth key rotates every 6 months to do an AKL on a 2020 Outback.

Subaru Legacy 2020

Autel IM608/IM508 XP400 Pro

Blade Key AKL: Yes

You can see the AKL function under the immo tab for bladed types.


Smart Key AKL: Partially 

Autel adds all smart keys lost function for some models as of 2021 including Outback and Legacy with the large vertical dash screens.  

People have done a few even 2022.  You are able to generate analog key under smart key.

2020 Outback (new system) all keys lost was done by autel im508 and Apb112. Worked great. This was just added in the last update for this system.

Generate analog key then add smart key.

If you do the job with an autel with the help of the apb112 your AKL scenario becomes an add key scenario no need to smart box reset.  It reads the immo data from the vehicle and then creates a temporary smart key to turn on the ignition.  Then you add a new smart key.

Autel Im608 Subaru Outback 2020 Akl 2 Autel Im608 Subaru Outback 2020 Akl 3

Review :

I was able to program a key using an Autel IM508 along with an APB112 smart key simulator without replacing any parts. I now have a working key which should allow me to use other functions on the IM508 like removing the old keys.

The process is relatively easy. Using manual selection, pick your manufacturer, model, and year range from the menu. Find the Generate Analog Key option in the Immobilizer section and follow the on-screen steps; as long as it let’s you save the EEPROM data you should be good to proceed. Once that is done, it should direct you to connect the APB112 where it will create a simulated key. If that goes well, you can then use the Add Key prompt to create a new key (do not disconnect the APB112 during that process).

For reference, my vehicle is a 2020 Subaru Outback (NA) with the following part numbers:

SMT: 88801AN000
ESCL: 83126AN00B


If you cannot read eeprom to generate analog key for other 2020+ Outback and Legacy new system, you need to change new smart box and steering lock or access with SSM4.



Subaru SSM4:

SSM4 can connect to Outback/Legacy 2020+ new system. An 8-digit “Authentication Key” supplied by SBR will be a required input when working with SSM4.  Unlike the previous system where Teaching Codes have been unchanged, the new Authentication Key will change approximately every 6 months.   The new vehicles utilize an Immobilizer Type “G” or “H” system depending on model:

  • G:  Vehicles with a turn key ignition switch
  • H:  Keyless Access with Push-Button Start.


Here is the procedure to perform immobilizer-related repairs on the all-new 2020-2021 year Subaru Legacy and Outback.

Connect SSM4 device to the vehicle and start SSM4 application, from the Main Menu, select Immobilizer etc. registration, select the Vehicle then Immobilizer Type and Confirmed.

Subaru Ssm4 Program Key 1

Subaru Ssm4 Program Key 2

Subaru Ssm4 Program Key 3

When the vehicle utilizes either a G or H -Type system, an Authentication Key is required to perform any of the immobilizer-related functions listed in the menu shown below.

Subaru Outback 2020 Ssm4

Currently, for all other models, the immobilizer registration process is unchanged.

For 2020MY Legacy and Outback with a G or H -Type system, the Server Connection screen shown below will be displayed. Input the current Authentication Key and select “Connection”.


As of June 30th, 2022, the Authentication Key has been revised to XFT7DWTH.

Subaru Ssm4 Program Key 4

Models affected:




OBDSTAR X300 DP Plus/X300 Pro4

OBDSTAR X300 DP Plus and X300 Pro4 Subaru Immobilizer software V30.52 adds Subaru 2019- Smart Box Reset.

Subaru Immo V30.52

smart box reset (all keys lost)
BRZ 2019-
Outback 2019-
Forester 2019-
STI 2019-
Impreza 2017-
WRX 2019-
Legacy 2019-
XV 2017-


OBDSTAR technician has confirmed that both 2020/2021 Legacy and Outback proximity all keys lost can be done via smart box reset. European Proximity only, Not for US models. obdstar won’t do 20/21 blade key AKL yet.


Subaru Immo V30.53

Adds Legacy and Outback 2021- proximity, add key, program smart box, program ESCL, program ECM, program remote control.

Obdstar Subaru Update



Smart box reset (all keys lost) Menu path:

Immobilizer- Subaru latest software version- Manual select model- Select region- Outback- Proximity- 2019 up- Advanced Functions- Reset smart key ECU (all keys lost)

Obdstar Subaru Outback 2021 Akl 1 Obdstar Subaru Outback 2021 Akl 2 Obdstar Subaru Outback 2021 Akl 3 Obdstar Subaru Outback 2021 Akl 4 Obdstar Subaru Outback 2021 Akl 5 Obdstar Subaru Outback 2021 Akl 6