2015 Lexus GX
Key Replacement - Save vs Dealer in San Diego

2015 Lexus GX Smart Key Replacement - Fast, Affordable & Professional

A real estate agent called me at about 8 in the morning from an office parking lot in Downtown La Mesa. She had a client showing at 9, her GX was sitting right there, and the start button was doing nothing.

She had already tried holding the fob against the button, which tells me she had done some reading. Smart move, actually. When the fob battery is completely gone, holding it near the button lets the vehicle read it passively. It did not work, which meant this was not just a dead CR1632.

I was there in under 30 minutes. She was standing by the driver door in a blazer checking her phone every two minutes.

I got inside, connected through the OBD port, and pulled the fault history from the security system. There was a communication fault logged for the fob, not a hardware failure on the vehicle side. The fob itself had developed a registration mismatch, which can happen after a battery dies completely and the fob loses its sync state. I registered a fresh fob to the vehicle, confirmed all four buttons, checked that the start button responded from the driver seat and from outside the door handle, and had her engine running with about 40 minutes to spare before the showing.

She made it. The dealer comparison came up while I was packing my bag. She had called the dealership first, before calling me. They had quoted her an appointment the following afternoon. That was the end of that conversation.

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