2011 Mazda CX-9
Key Replacement - Save vs Dealer in Ventura County

2011 Mazda CX-9 Smart Key Replacement - Fast, Affordable & Professional

A roofing contractor called me at 6:30 in the morning from a supply yard near Hammonds Beach in Montecito. His crew was on the clock, a materials run was holding up the whole job, and his CX-9 was sitting there dead to his key fob. He kept pressing the start button with the fob right on top of it. Nothing.

I keep my van loaded and rolling by 6am. Got to him in about 25 minutes.

First thing I did was use my MAZ24 Lishi to pick the door, since the emergency key blade in these fobs only works if you remember to pull it out, and most people forget it's even in there. Once inside, I held his fob against the start button column and got the engine to turn over, which told me the passive RF side was dead but the backup low-frequency rescue loop still worked.

Popped the fob open on the hood. The CR2025 was toast, reading under 2 volts. Replaced it, but the keyless module had already lost sync with the fob. Connected through OBD, ran the MDARS re-registration, sat through the timed security wait that nobody can skip, and confirmed all four buttons plus the passive entry on both front door handles.

Thirty minutes of hands-on time. He was loaded and headed to the job site by 7:30. The dealer route would have meant a tow, a wait, and a crew sitting idle all morning for a fraction of the cost.

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