2016 Fiat 500x
Key Replacement - Save vs Dealer in San Diego

2016 Fiat 500x Smart Key Replacement - Fast, Affordable & Professional

I got a call from a guy in Lakeside Proper, over near the Grocery Outlet lot, who drove a school bus for work and needed his personal car to be completely reliable. He had a 2016 Fiat 500x. Another locksmith had cut and programmed a replacement key for him, and it seemed fine at first.

Then it started getting weird. The car would start without any trouble in the morning. By afternoon, on the drive home, the engine would cut out intermittently. He brought it to a shop thinking he had an electrical gremlin. Nothing showed up. The shop cleared it and sent him home. It happened again.

By the time he called me, he was convinced the car itself had a problem. I asked him when the key was made. He told me. I had a hunch.

I looked at the key with my diagnostic equipment right there in the lot. The transponder inside it was a generic clone, not the correct type matched to his vehicle's security system. These systems don't always reject a mismatched chip on the first start. They can accept it initially, then fail the deeper verification check over several drive cycles. That's exactly what his car was doing.

I programmed a new key with the correct transponder, registered it properly through the OBD port, and confirmed the vehicle security system accepted it fully. His CR2032 in the fob was also reading low, so I put a fresh one in before I left.

He texted me a few weeks later to say it hadn't missed a beat. No stalling, no warnings, nothing. The dealer was going to charge him a significant amount just to diagnose it. He saved a good chunk by having it handled correctly the first time, on site, in that parking lot.

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