2002 Toyota Prius
Key Replacement - Save vs Dealer in San Diego

2002 Toyota Prius Transponder Key Replacement - Fast, Affordable & Professional

I got a call from a woman parked near the Encanto Border side of Lemon Grove. She had been using her 2002 Prius every day, and one morning it just stopped starting. Turned the key, engine cranked, then cut out immediately. She thought it was a fuel problem. Her mechanic thought so too, until he noticed the security light staying on after crank.

That's the tell on these first-gen Prius cars. The immobilizer kills the engine fast, usually within a second or two of startup. It doesn't always mean the key is bad. Sometimes it means the transponder chip inside the key head has degraded enough that the reader coil around the ignition barrel can't get a clean signal. The key looks fine. The blade still turns. But the chip isn't talking right.

She had one key. Original, used daily for years. The chip inside was original too.

I pulled up to her in Lemon Grove, verified the VIN, checked her ID and registration, and got to work. Cut a new key blade to match her ignition and door locks, then programmed a fresh transponder chip to her car's immobilizer through the OBD port. Took about 30 minutes including the verification steps.

She turned the key and it started clean. No stall, no security light.

The dealer had already quoted her a tow plus a same-day appointment that was actually two days out. She saved a good chunk just by not going that route, and she didn't lose the car for two days.

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