2021 Toyota Prius
Key Replacement - Save vs Dealer in Ventura County
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2021 Toyota Prius
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2021 Toyota Prius Smart Key Replacement - Fast, Affordable & Professional
Pleasant Valley area, Oxnard. The 2021 Prius owner was convinced her smart key was dying. "Key Battery Low" message every start, had to hold the fob against the button half the time.
She'd already replaced the CR2032 twice. Still got the warnings.
I pulled up with my Autel IM608 and checked the obvious first. Fresh CR2032 in her HYQ14FBE-0410 fob tested at 3.2V. Perfect. But when I hooked up to check the car's 12V auxiliary battery under the rear cargo panel, it read 11.8V. There's your problem.
The 2021 Prius uses that 12V battery to power all the computers, including the Smart Key receiver. When it drops below spec, the system can't properly detect the fob signal strength, so it throws "Key Battery Low" as a default error. Toyota even put out a service bulletin about it.
I jumped the aux battery to get her running, then programmed a backup fob while we were at it. Told her to get that 12V replaced soon or she'd be calling me again in a week. The dealer would have sold her a new smart key for way more and never checked the real issue.
Smart key problems aren't always smart key problems. Sometimes it's the simple stuff hiding behind the computer errors.
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“I lost my Honda Passport key and called EZ Car Keyz. He came out and made a new key in under five minutes. Legendary service.”
“They responded instantly, showed up within an hour, and arrived exactly when they said they would. Made a copy and programmed a fob for my 2014 car with a worn ignition in about 15 minutes. The new key works perfectly and feels like a dealer key.”
“About 15 minutes after calling, he was already at my home. I had lost my original Ford key and he made and programmed a new one on the spot. Very fast, very professional.”
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