Infiniti QX50 & QX55 Spare Intelligent Key — Keller TX
A second Intelligent Key for a QX50 or QX55 costs roughly half what a lost-all-keys replacement does. A Keller TX locksmith covers spare-key pricing, timing, and the emergency blade most owners never find.
This is the cheerful version of an Infiniti key article. Nobody has lost anything, nothing is broken, and the only thing at stake is whether you pay roughly half price now or full price later. Adding a second Intelligent Key while your first one works is the least dramatic and most economically sensible job on our whole list. Call or text (817) 968-3866.
Quick Answer
A spare Intelligent Key for an Infiniti QX50 or QX55 in the Keller area typically runs $300–$480 and takes 30 to 50 minutes at your location. The same key after your only one is gone runs $430–$700 and takes considerably longer, because the vehicle has no authorized credential to verify against. The spare is not an upgrade — it is the discount.
Keller Pricing
Ranges only, as of August 2026. Model year and fob part number set the final figure.
| Service | Typical range |
|---|---|
| Spare Intelligent Key, working key present | $300–$480 |
| Intelligent Key, all keys lost | $430–$700 |
| Emergency blade cut only | $90–$160 |
| Third key added at the same visit | $200–$330 extra |
| Fob shell replacement, electronics reused | $80–$150 |
| Purge a lost or stolen key from memory | Usually bundled |
| Battery replacement and function check | Often no charge with service |
That gap between the first two rows — routinely $130 to $220 — is what the anti-theft design charges for having no backup. It is not negotiable. It is only avoidable in advance.
Why the Spare Costs So Much Less
One question decides everything: can anyone here prove they belong to this vehicle?
With a working key present, yes. Your QX50 already has an authorized credential sitting in the cabin, so adding a second one is a short, permission-granted operation. Under an hour, done.
With every key gone, no. The vehicle has to enter a secure registration state, the emergency blade has to be cut to your VIN rather than copied, and proof of ownership becomes mandatory paperwork rather than a formality. On many modern platforms the vehicle also enforces its own security timing during that process.
So the price difference is not markup. It is the cost of the vehicle being genuinely difficult to steal — which is a feature you paid for and should want working.
The Emergency Blade Nobody Ever Finds
Worth its own section because it prevents tow trucks.
Inside your Intelligent Key is a small mechanical blade. It releases from the fob body, usually via a catch or slide. That blade opens the driver's door when the fob's coin cell dies or the vehicle's 12V battery goes flat.
Most owners discover this exists on the worst possible day. Spend thirty seconds right now: find the release, slide the blade out, look at it, put it back. Then check the driver's door handle — on many modern vehicles the keyhole hides under a small cap that pries off.
Two things to know. The blade opens the door but does not start the vehicle. And most push-button Infinitis have a backup start method using the fob held against a specific spot in the cabin — your owner's manual documents the exact location for your model. Read it before you need it, not during.
Common QX50 and QX55 Situations
Bought used, came with one key
The most common reason people call us about these vehicles. A second-owner QX50 very often arrives with a single fob because the original was lost years ago and never mentioned in the listing. That vehicle is one dropped fob away from a $600 afternoon.
If you are still shopping, ask for both keys before you sign or price the second one into your offer. It is the easiest few hundred dollars anyone will ever negotiate.
The fob only works from a few feet away
Coin cell, nearly always. Shrinking proximity range is the standard early symptom of a dying battery, and it costs a few dollars to eliminate. If range stays poor with a fresh cell, the fob itself may be going — which is precisely the moment to add a spare rather than wait to be down to zero.
The vehicle is completely unresponsive
Check the 12V battery before assuming a key fault. On a proximity-key vehicle a flat 12V means the car cannot listen for the fob at all, and it presents identically to a dead key. Use the emergency blade to get in, then sort the battery. We test it before selling anyone a key.
The fob starts the car but the buttons do not work
Remote fault, not immobilizer fault. Proximity and start functions can be perfectly healthy while lock and unlock have died. Often reprogrammable or repairable without buying a whole key.
A fob went through the laundry
More common than anyone admits. If you still have a working second key this is routine. If that was your only key, it just became an all-keys-lost job — the argument for the spare, in one sentence.
What We Need From You
For a spare with a working key present: the vehicle, your existing key, and photo ID. That is genuinely all.
For all keys lost: photo ID plus registration, title, or an insurance card showing the same VIN and a matching name. Not waivable. If the vehicle is titled to a business, a spouse, or a trust, tell us when booking so the paperwork is sorted before a technician drives out.
The Honest Boundary
We confirm the year before quoting firmly. The QX50 was substantially redesigned during its run, and the QX55 is its own thing again. A price given without a model year is a guess.
Very late-model configurations get a VIN check. Manufacturers keep tightening key security. If your specific build turns out to require a dealer path, we say so on the phone rather than after collecting a trip charge.
Larger Infiniti platforms differ. If you have a QX80, the module architecture is a different conversation — see our QX80 immobilizer module programming guide. The broader Nissan-family Intelligent Key picture is covered in our Nissan and Infiniti body-module article.
Premium marques generally follow this same logic. If you also run a European luxury vehicle in the household, the credential-not-part principle applies there too — our Porsche key replacement guide walks through a comparable set of constraints.
How the Keller Appointment Works
Mobile, at your vehicle — driveway, office lot, wherever it sits. Coverage runs across Keller 76248, Southlake, Colleyville, Grapevine, Watauga, Haslet, Argyle, Justin, North Richland Hills, and the surrounding Tarrant and Denton County communities.
If your household runs more than one vehicle, mention it. Programming spares for two cars in a single visit costs less than two separate call-outs.
Frequently Asked Questions
How much is a spare key for an Infiniti QX50?
Roughly $300–$480 in the Keller area when you still have a working key, as of August 2026. The same key after all keys are lost typically runs $430–$700.
Do I need to go to an Infiniti dealer for a spare key?
No. A mobile automotive locksmith registers the new Intelligent Key and cuts the emergency blade at your location, with no tow and no service-drive appointment.
How long does an Infiniti spare key take?
Usually 30 to 50 minutes on-site with a working key present. All-keys-lost jobs take substantially longer.
Where is the emergency key in an Infiniti fob?
It releases from the fob body via a catch or slide, and it opens the driver's door when the fob or vehicle battery is dead. The door keyhole may be hidden under a cap on the driver's handle.
Can you program an Intelligent Key I bought online?
Sometimes. It must be the correct part number for your year and must not already be locked to another vehicle — a surprising share of discounted fobs are one or the other. We check and tell you before charging you.
My QX50 is completely dead — do I need a new key?
Test the 12V battery first. A flat 12V leaves the vehicle unable to listen for the fob at all, which looks exactly like a dead key and is far cheaper to fix.
Want a second key for your QX50 or QX55 before you need one? Call or text Keller Locksmith at (817) 968-3866 — Keller, Southlake, Colleyville, Grapevine, and across northeast Tarrant County.
Written by the Kellerlocksmith Automotive Locksmith Team — mobile automotive locksmiths serving Keller, Southlake, Colleyville, Grapevine, and the surrounding Tarrant and Denton County communities.
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