2015 Toyota Sienna
Key Replacement - Save vs Dealer in Ventura County

2015 Toyota Sienna Smart Key Replacement - Fast, Affordable & Professional

A mom in Madera called me on a Wednesday morning. She was already at the dentist's office parking lot in Simi Valley, toddler in tow, and her Sienna was showing a key-not-detected warning every time she tried to start it. The fob would unlock the doors fine but the start button kept rejecting it. She had been holding the fob against the button to get it to turn over, the old backup trick, and it was working maybe half the time.

She called the dealer first. They said Monday. This was Wednesday.

I pulled up to the lot that afternoon. The battery in the fob was original, which on a 2015 means it had been in there a while. Swapped the CR2032, tested the start button response immediately. Still inconsistent. That told me the fob itself had likely taken some damage internally, probably from a drop at some point, which is one of the more common ways these proximity fobs die quietly over time.

Cut a new key blade for the emergency insert, registered the new fob to the vehicle through the diagnostic port, and walked every function: door handles, start button, lock, unlock, all of it. Everything came back clean.

She was back on the road that afternoon. The dealer comparison came up at the end almost as an afterthought. She mentioned they quoted her parts plus labor plus the tow. She paid a fraction of that and lost maybe ninety minutes of her Wednesday instead of four days of her week.

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