2007 Mercedes-Benz SL
Key Replacement - Save vs Dealer in Ventura County

2007 Mercedes-Benz SL Remote Head Key Replacement - Fast, Affordable & Professional

Got a call from a guy up near the San Ysidro Trail area in Montecito. His 2007 SL550 had one working key left, and the chrome side buttons were so worn the lock and unlock barely registered. He had been pressing them harder and harder for months, like that would fix it.

I pulled up and he had the car in his driveway with the top down. Beautiful car. He handed me the old key and the infrared emitter window on the bow was scratched to hell from years of pocket carry. That alone can weaken signal to the EIS module.

Cut the new blade on site to match the original HU64 profile, then connected to the OBD-II port and ran the key adaptation through the EIS. The R230 EIS on FBS3 stores key data internally, so the process involves reading the module, writing the new key's transponder data, and confirming the immobilizer handshake. Whole thing took maybe 35 minutes including testing all four remote buttons and cycling the ignition a few times.

He sat in the driver's seat after and just kept clicking the lock button, watching the mirrors fold. Said it had been over a year since that worked right. Then he asked what the dealer wanted for the same job. I told him he saved a good chunk. He just nodded and went back to clicking.

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