2003 Toyota Prius
Key Replacement - Save vs Dealer in San Diego

2003 Toyota Prius Transponder Key Replacement - Fast, Affordable & Professional

A woman in Old Town National City flagged me down through a mutual contact. She had a 2003 Prius and only one working key left. She wasn't locked out, nothing was broken. She just wanted a spare before she ended up in a situation where the one key she had became the problem.

Smart move. I get that call after the emergency too, and it's always a harder conversation.

She had already called the Toyota dealer. Parts, cutting, programming labor, shop fees. She wrote the number down on her phone's notepad and showed it to me. It was not a small number. That was before factoring in that she'd have to drop the car off on a weekday and arrange a ride.

I showed up to where her Prius was parked. Cut the replacement key blade to match her vehicle right there on the machine in my van. Then I connected my diagnostic equipment to the OBD port under the dash. The 2003 Prius immobilizer communicates over that port, and the tool reads the security data, calculates what it needs, and registers the new transponder chip to the system. The whole process took less than an hour.

She tested it herself. Turned the key, engine started, no stall, no warning on the dash. That is the confirmation that the chip took. Then she tested the original key to make sure I hadn't disturbed anything. Both keys worked.

The dealer comparison came up again at the end, almost like an afterthought. She said she saved a good chunk. I told her that's usually how it goes on these older Toyotas.

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