2010 Scion TC
Key Replacement - Save vs Dealer in San Diego

2010 Scion TC Remote Head Key Replacement - Fast, Affordable & Professional

There is a CrossFit gym near Downtown Ramona, and the parking lot there is where I met a guy who had been fighting his 2010 Scion tC ignition for a few weeks.

Not a total failure. Just inconsistent. Some mornings the key turned fine. Other mornings he sat there working it back and forth for five minutes before it caught. He had already been to the dealer. They told him he needed a new ignition cylinder, new keys, and a full reprogram. He was two days from booking the appointment when a friend pointed him my way.

I pulled up, he handed me the key, and I could feel the problem before I even looked at the cylinder. The blade had worn unevenly from years of daily use, and the wafers inside the lock had enough slop to cause that catch-and-release routine he described.

I backed up the immobilizer data before touching anything mechanical. That step matters. If you disturb the wrong thing on these without protecting the security data first, you turn a worn ignition into an all-keys-lost situation, and that is a harder job. Once that was secured, I decoded the lock, replaced the worn wafers, and cut a fresh key blade matched to the cylinder. The remote function on the new remote head key synced back through a quick procedure at the OBD port. I showed him the old wafers so he could see exactly what was causing the intermittent bind.

The dealer quote included a full cylinder assembly and parts he did not actually need. His ignition turns smooth now, and he made his morning class.

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