2019 Toyota Tundra
Key Replacement - Save vs Dealer in Ventura County

2019 Toyota Tundra Smart Key Replacement - Fast, Affordable & Professional

Got a call from a guy near Ventura Music Hall in Ventura. His 2019 Tundra threw "Key Not Found" on the dash and the push-button start went dead. He had already swapped the CR2032 twice. Bought a two-pack from the gas station across the street, tried both. Nothing changed.

When I pulled up he was sitting on the tailgate scrolling through forums on his phone, half-convinced his smart key computer had failed. People online were quoting him the Toyota part number for the whole smart key ECU, 89990-0C020, and telling him to get it towed to the dealer.

I popped the HYQ14FBA open on his tailgate. The CR2032 was fresh, like he said. But the negative contact spring was bent almost flat. Barely touching the battery. That is one of the most common things I see on these Tundra fobs because the back cover pries off hard and people lever against the contact plate without realizing it.

Straightened the tab, cleaned both contacts, reseated the battery. "Key Not Found" cleared on the first press. Walked every function: lock, unlock, panic, push-button start from driver seat and passenger seat, and checked the door handle touch sensor on both front doors.

He stared at the dash for a second like he didn't trust it. Then he just said, "That's it?"

That was it. No new ECU, no tow, no dealer wait. A five-minute fix near a music venue on a Tuesday afternoon.

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