Question 1

Do you use OEM or aftermarket key fobs for the 2017 Lexus LS?

Accepted Answer

We use fresh, unregistered blanks built to OEM specification, meaning the factory FCC ID, correct transponder chip, and proper frequency match for this vehicle. That last part matters more than most people realize.

A used OEM fob pulled off another Lexus sounds like a good deal until you find out it's already married to that previous vehicle and cannot be reprogrammed. This comes up on Lexus forums constantly. Someone buys a used fob online, pays a locksmith or dealer to program it, and gets told it can't be done. The fob is locked. Money wasted, no key.

Starting with a verified blank cuts that problem off entirely. We know what we're putting in before we show up.

Question 2

How long will a replacement smart key last on a 2017 Lexus LS?

Accepted Answer

The programming itself doesn't expire or degrade. A properly paired fob on this vehicle should work for the life of the car. What wears out over time is the physical stuff: the CR1632 battery, the rubber button pads, and occasionally the key shell if it gets dropped enough times. We put a fresh battery in with every key we make. Most owners are changing the battery every two to four years depending on how much they use the fob and where they store it. If a key that was working fine suddenly starts acting up, battery is the first thing to check before assuming the programming slipped.

Question 3

What if the replacement key stops working a few weeks after you program it?

Accepted Answer

Call us. Our work is covered under warranty.

That said, when a freshly programmed fob on a 2017 LS starts acting up shortly after, the problem is usually coming from the vehicle side, not the key. Lexus owners have reported cases where a setting buried in the vehicle's own menu system quietly disabled smart key reception, making a perfectly good fob look dead. Others have traced intermittent failures to a corroded battery contact inside the fob that looked fine at a glance.

We don't just hand you a key and disappear. If something's off, we troubleshoot what's actually causing it.

Question 4

I have a spare key for my 2017 LS that I never registered. Can it still be added to the car?

Accepted Answer

Yes, as long as it's a blank that was never previously married to another vehicle. An unregistered fob can be programmed in alongside your existing key at any point. This is actually the best time to do it, while you still have a working key, because adding a second key to a system that already has one working key is a faster and simpler process than an all-keys-lost situation. If you've had that spare sitting in a drawer, getting it programmed before something happens to your primary fob is genuinely worth doing.

Question 5

My 2017 LS lost all keys. Is that a harder job than just adding one?

Accepted Answer

It is, but it's a standard job. All-keys-lost on this vehicle requires a full reset of the vehicle's key memory through the diagnostic port before any new fob can be registered. That reset has a timed sequence built in, so the job takes longer than a simple add-a-key, typically 45 minutes to an hour on site. Once the reset completes, new fobs are registered, the emergency insert blade is cut to the vehicle, and any previously existing keys are wiped from the system so they can't be used to start the car. Bring the vehicle's registration. On some Lexus all-keys-lost jobs, verifying ownership before the reset is part of the process.

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