Question 1

How long does the Infiniti dealer actually take for a Q50 key replacement?

Accepted Answer

Longer than you'd expect. The Q50's smart key is VIN-linked, and dealers typically can't pull one off a shelf. They order it from a regional parts distribution point, which owners on Q50 forums have reported taking anywhere from two days to over a week depending on stock. Once the key physically arrives, you still need a shop appointment for the programming step, which runs through Infiniti's own diagnostic interface. Dealers also tend to invoice the fob, the labor, and the programming as separate line items, so the total climbs fast.

Add it up and a realistic dealer timeline is three to five business days minimum before you're driving again. That's if nothing gets backordered. I carry blank fobs that cover the 2016 Q50, do the full job at your car in one visit, and I work weekends. No waiting for parts to ship, no scheduling around dealer hours.

Question 2

What exactly is a smart key and how is it different from a regular car key?

Accepted Answer

Your 2016 Q50 fob doesn't go into a slot or a cylinder. It stays in your pocket or bag, the vehicle's antenna network detects it within a certain range, and that's what authorizes the door handles and the start button. There's a programmed transponder chip inside the fob that has to match what the immobilizer has stored. If that pairing isn't there, the car won't start, full stop.

The five buttons handle the remote functions. There's also a mechanical insert key stored inside the fob body for emergencies, like getting into the car when the battery is completely dead.

A key someone orders online is just a blank. It won't do anything until it's paired to your specific vehicle through a diagnostic tool. That's the step that requires a locksmith or a dealer.

Question 3

Why does replacing an Infiniti key cost so much more at the dealer?

Accepted Answer

A few reasons stack up. Dealers source the fob through their parts department, not the open market, and that markup is built in before anyone touches your car. Then they bill programming as a separate labor line. Some Infiniti service writers also tack on a diagnostic fee before any work starts. One Q50 owner on a forum described being quoted a diagnostic charge just to confirm which key the car needed, before the order was even placed.

A mobile locksmith sources the same compatible hardware at better cost, brings the programming equipment to your car, and bills it as one job. No loaner, no waiting room, no per-line invoice.

Question 4

I bought a replacement fob online for my 2016 Q50. Can I program it myself at home?

Accepted Answer

No. There is no ignition-turn sequence or button trick that works on the Q50 smart key system. Pairing a new fob requires a professional diagnostic tool connected to the OBD port. The vehicle's security system has to be placed into a key-learning mode through software, and the new fob's transponder gets registered during that session. Without that step, the fob is just a plastic remote with no relationship to your car.

If you already bought the fob, that's fine. Bring it along and I can program it as long as it's the correct blank for your vehicle. You'll save on the fob cost and just pay for the programming work.

Question 5

My Q50 shows a key warning on the dash but the fob battery is new. What else could cause that?

Accepted Answer

A few things. The CR2032 could be new but seated wrong, with one contact tab not fully touching the cell. That's more common than people think because the fob clips are easy to seat slightly off when you're snapping it back together. Clean both contacts with a dry cloth and reseat the battery before anything else.

If that's not it, the door handle antennas are worth checking. The Q50 uses antennas embedded in the door handles to detect the fob at close range, and owners have reported that corrosion or a wiring issue at one handle can confuse the system even when the fob itself is fine. You'd typically see it show up as one handle responding slower than the others.

A persistent key-not-detected warning with a good battery and clean contacts usually means the fault needs to be read with a diagnostic tool to know whether it's the fob registration, an antenna circuit, or something in the body control side. That's the only way to know for certain what's actually being flagged.

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