Question 1

Do I have to go to the Infiniti dealer to get a replacement key for my 2008 EX35?

Accepted Answer

No. A mobile locksmith with the right Infiniti-capable diagnostic equipment can cut and program a smart key for the 2008 EX35 on site, wherever the car is parked. The intelligent key system on this vehicle does require proper programming tools to register a new fob to the immobilizer. That's not dealer-exclusive equipment. It's just specialized equipment that not every locksmith carries.

The luxury badge sometimes makes owners assume the dealer is the only path. It isn't. The right call is finding someone who specifically works Infiniti and Nissan intelligent key systems, confirms they have the tooling before you book, and comes to you instead of making you tow the car in.

Question 2

What exactly is a smart key and how does it work on the EX35?

Accepted Answer

The fob your 2008 EX35 uses does more than just lock and unlock remotely. It contains a transponder chip that the vehicle's immobilizer reads every time you go to start the car. If that chip isn't recognized, the engine won't run, regardless of whether the key turns or the button gets pressed.

There's also a physical blade folded inside the fob body. If the fob battery dies completely, you pull that blade out, use it to get into the car manually, and then hold the fob against the start area so the vehicle can read the chip passively without needing battery power. Four buttons handle the remote functions.

The whole thing has to be programmed to your specific vehicle. A fob that hasn't been registered to your car's immobilizer won't start it, even if it looks identical to your original.

Question 3

How long does getting a replacement key through the Infiniti dealer actually take?

Accepted Answer

Usually longer than owners expect. Dealers typically need to order the intelligent key by VIN, and that can mean waiting several business days for the part to arrive. Once it's in, you're looking at at least an hour of shop time for programming and testing on top of the wait.

Owners in online discussions about this generation of Infiniti frequently mention being told two to three days, then having to follow up when the part doesn't show on schedule. Some end up without their vehicle for the better part of a week over what should be a routine key job.

With EZ Car Keyz, the job is done in one visit at your location. No drop-off, no waiting on a parts order, no second trip back.

Question 4

My EX35 shows a key warning on the dash and won't start, but I didn't lose the fob. What's going on?

Accepted Answer

First thing to check is the fob battery. A low CR2032 in the intelligent key fob can drop signal strength enough that the vehicle throws a key-not-detected warning even when the fob is right there in your hand or pocket. It doesn't have to be completely dead to cause this.

If a fresh CR2032 doesn't fix it, try holding the fob directly against the start button area when you press it. That lets the vehicle read the chip passively at close range, bypassing the wireless entirely. If the car starts that way, the fob itself is the issue, either the battery contacts, a weakened transmitter board, or a cracked internal connection from a drop.

If the car won't respond even with the fob pressed directly to the button, that points somewhere else, either the fob's chip, a module issue, or a key registration that got corrupted. That's when you call a tech rather than keep guessing.

Question 5

I bought a replacement fob online for my 2008 EX35. Can I program it myself?

Accepted Answer

No. The intelligent key system on the 2008 EX35 does not have a DIY relearn sequence like some older transponder-key vehicles do. Registering a new fob to the immobilizer requires diagnostic equipment connected to the vehicle. There is no ignition-turn cycle or button combination that gets you there on this system.

The fob you bought online is just hardware until it gets programmed. It won't lock the doors, won't be recognized at the start button, and won't communicate with the immobilizer until a tech with the right tools pairs it to your car. Bring the fob you bought and we can register it on site, which is often still a solid way to save money compared to buying through the dealer, as long as the fob you sourced is the correct one for this vehicle.

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