JDM Subaru WRX S4 2015 Smart key programming HELP NEEDED

[Alex Xu]

Hi everyone,

I have a Japanese import Subaru WRX S4 GT-S Eyesight (2015).

Original key:
• Subaru smart key part number: 14AHA-01
• Frequency: 312.15 MHz FSK (JDM)
• Push start + Eyesight

I bought a genuine replacement key (same part number) from China, but it cannot be programmed.
The car does not recognise the transponder at all.

What I’ve tried:
• Local UK auto locksmith – failed (no transponder detection)
• Subaru UK dealer – confirmed they cannot program JDM keys
• Advised to contact Subaru Japan

I understand this is a JDM immobiliser / SSM issue rather than just a remote pairing problem.

Question:
Has anyone in the UK/EU successfully programmed JDM Subaru smart keys
(WRX S4 / Levorg / JDM Impreza, 312MHz)?
Or knows a specialist / importer / locksmith who can handle JDM immobiliser programming
(SSM3/SSM4, EEPROM, ECU bench work, etc.)?

Any advice or contacts would be hugely appreciated.
Thanks in advance!