As of September 2026 in Fort Worth, an Infiniti QX70 smart key is ordinary Infiniti work — Intelligent Key, NATS immobilizer, the same family of procedure as a QX50 or a Pathfinder, priced in the $220 – $450 smart proximity band. An Infiniti QX30 is not, because it was built on a Mercedes-Benz platform and carries Mercedes-derived electronics including its key system, which puts it in the $300 – $700+ luxury and European band and changes what an all-keys-lost job looks like entirely. Same brand, same showroom, two unrelated answers. Call or text 817-674-2304 with your VIN and we will tell you which of these two jobs you actually have before anyone quotes you.
The Thing Nobody Tells QX30 Owners
The QX30 sold in the United States for model years 2017 through 2019 as Infiniti's compact crossover. It looks like an Infiniti, it is badged as one, and the dealer that sold it is an Infiniti dealer.
Underneath, it is a different car. The QX30 was produced at Nissan's plant in Sunderland, England, on the Mercedes-Benz MFA architecture shared with the Mercedes GLA and A-Class of that period, using Mercedes powertrain and electrical systems. That collaboration was public at launch and it is visible in the vehicle itself — the switchgear, the diagnostic behaviour and, most relevantly here, the key.
You can confirm the build origin yourself in about thirty seconds. Run your VIN through the NHTSA VIN decoder, which returns the manufacturer and plant of assembly from the public federal database. A QX30 will not decode the way a QX50 does.
For key work, that single fact reorganises everything below it.
The Two Jobs Side by Side
| Infiniti QX70 (2014 – 2017) | Infiniti QX30 (2017 – 2019) | |
|---|---|---|
| Underlying platform | Nissan / Infiniti FM architecture | Mercedes-Benz MFA architecture |
| Key family | Infiniti Intelligent Key | Mercedes-derived key system |
| Immobilizer | NATS | Mercedes electronic key authorisation |
| Fort Worth price band | $220 – $450 smart proximity | $300 – $700+ luxury / European |
| Spare key with one working key | Routine mobile appointment | Platform-dependent, confirm by VIN |
| All keys lost | Standard decode-and-program path | Frequently routes to the dealer |
| Emergency blade in the fob | Yes, cut as part of the job | Yes, cut as part of the job |
Bands are from our published car key replacement cost page.
The QX70: Ordinary Infiniti Work
The QX70 is the FX renamed. Infiniti dropped the FX badge after the 2013 model year and the same vehicle continued as the QX70 through 2017, which is why a parts counter will sometimes ask you for a model year and then say "so, an FX".
Everything about its key is familiar Infiniti territory. It is an Intelligent Key proximity fob with push-button start, the immobilizer is Nissan's NATS, and the fob carries a mechanical emergency blade behind a release catch for the times the vehicle's 12-volt battery is flat.
With one working key, a spare is a routine mobile appointment — the technician comes to the vehicle, registers the new fob and cuts the emergency blade, typically inside an hour. It prices in the smart proximity band.
With no working keys, it follows the ordinary all-keys-lost sequence: derive the cutting code, produce a blade that turns the door lock, then establish authorisation and register a new credential. That adds the published $50 – $200 all-keys-lost surcharge, and our spare-now versus all-keys-lost-later cost math puts the two routes against each other with real numbers.
One QX70-specific note worth having: the earlier FX generations in this family are known for steering-lock and ignition-side complaints as they age, which we covered separately in FX35, FX45, M35 and M45 steering lock and key problems. If your QX70 is refusing to come out of the steering lock rather than refusing to recognise the key, that is a different fault with a different fix.
The QX30: Why It Behaves Like a Mercedes
Mercedes has run a generational electronic key authorisation architecture for decades, and the generations matter enormously to anyone outside a dealership. Earlier generations are well understood by independent specialists. The later generation that arrived on Mercedes models through the mid-2010s tightened the security model substantially, and on many vehicles in that era an all-keys-lost job is genuinely a manufacturer-side procedure rather than something a diagnostic tool solves in a driveway.
The QX30 sits in that later era. Which means:
A spare, with a working key in hand, is usually workable — but "usually" is doing real work in that sentence, and it is decided per VIN rather than per model. That is why we ask for the VIN before quoting rather than after.
An all-keys-lost QX30 frequently routes to a dealer. Not always, and we will tell you honestly which side of the line yours falls on, but it is common enough that anyone promising you a driveway fix sight-unseen has not checked. Our standing honest list lives at which cars need the dealer for key programming.
The part is a Mercedes-family key, not an Infiniti one. That changes sourcing, availability and price, and it is why the QX30 prices against the luxury and European band rather than the Infiniti one. Our European car locksmith and Mercedes key replacement pages cover that side of the work.
We would rather say this plainly than quote you a number that changes when the van arrives. A locksmith who tells you a QX30 is "just an Infiniti" is telling you they have not looked one up.
The Credentialing Layer Behind All of This
There is a reason "who can do this work" is a real question rather than a question about tooling.
The National Automotive Service Task Force operates the Secure Data Release Model, the industry framework under which independent technicians are identity-vetted before manufacturers will release key and security information to them. It exists so that "is this person allowed to make a key for this car" has a formal answer instead of a casual one.
Platforms differ in how much they release and to whom, and that variation — not tool quality — is what produces the honest line between "we can do this at your house today" and "this one belongs at a dealer". Any locksmith working on modern luxury vehicles should be able to explain where a given platform sits without hedging.
Texas licenses this trade through the Texas Department of Public Safety Private Security Program — not TDLR, which is a common mix-up — and verifying a company's licence is a short check worth doing before you hand over a VIN.
What We Need Before Quoting Either Vehicle
Four things, and they take a minute to gather.
- The VIN. On the QX30 it settles the platform question outright. On the QX70 it pins the exact key variant.
- Whether you have a working key. Worth $50 – $200 on the QX70 and considerably more than that on the QX30, because it is the difference between a workable spare and a job that may not be ours to do.
- The FCC ID on the back of your existing fob, if you have one. Every certified radio device in the US carries one and it is searchable in the FCC equipment authorization database. It eliminates most ordering mistakes.
- Proof the vehicle is yours. Registration or title plus matching photo ID, checked on site. Non-negotiable on any platform.
What the Appointment Looks Like
For a QX70 spare, it is a mobile visit. The technician arrives at the vehicle, verifies ownership, registers the new Intelligent Key to the immobilizer, cuts the emergency blade, and confirms both the proximity function and the push-button start before leaving. Forty minutes is typical.
For a QX30, the first appointment is often a diagnosis rather than a key. We confirm what the vehicle will accept, and then either proceed or tell you plainly that this one goes to a dealer and roughly what that route involves. We would rather spend a short visit establishing that than take a deposit against a job that cannot be completed.
Neither vehicle is work you should let somebody improvise on. A luxury crossover with a mis-handled immobilizer session is a considerably more expensive problem than the key was.
The Emergency Blade People Forget
Both fobs carry a mechanical emergency key inside the housing, released by a small catch. It exists for one specific scenario: the vehicle's 12-volt battery dies, the proximity system has no power, and the doors will not respond to anything.
A replacement fob that is programmed but never cut leaves you standing outside a car you own with a working key in your hand. We cut it as part of the job, and it is worth confirming that any quote you receive includes it — on proximity vehicles it is the single most commonly skipped line.
While the fob is open, note that this is also the compartment where the coin cell lives. If your existing fob's symptoms are intermittent rather than total, the battery circuit is worth ruling out before the fob is — the ladder for that is in changed the fob battery and it still does not work.
Telling Them Apart in Thirty Seconds
If you are not certain which of these two you own — and people genuinely are not, because both are Infiniti crossovers of the same era — three checks settle it without opening anything.
Size and body style. The QX30 is a compact hatchback-shaped crossover, close in footprint to a Mercedes GLA. The QX70 is a large, low, wide SUV with a long bonnet. They do not look alike in person.
The key itself. The QX70 fob is the familiar Infiniti Intelligent Key: a rounded rectangle with the Infiniti badge, lock, unlock, tailgate and panic buttons, and a slide catch releasing the emergency blade. The QX30 key does not look like that, because it is not from the same parts family.
The VIN. The definitive answer. Run it through the NHTSA VIN decoder and read the manufacturer and plant fields — a QX30 decodes to a UK-built Nissan vehicle, which is the whole story in one line.
Any of those three is enough for us to quote correctly on the phone, and the VIN is the one we will ask for.
Related Infiniti Work
If you landed here with a different Infiniti, the QX50 and QX55 sit firmly on the Nissan and Infiniti side of this divide and follow the ordinary Intelligent Key path — covered in QX50 and QX55 smart key replacement. The broader manufacturer coverage is on our brands page.
Where a fault turns out to be a module rather than a key — a body control module or immobilizer unit that has stopped accepting credentials at all — that becomes module programming work, which is a different diagnosis and a different price.
Mobile Service Across Fort Worth and Tarrant County
Infiniti key work is mobile wherever the platform allows it, because the vehicle has to be present regardless. We cover Fort Worth and the surrounding Tarrant County cities including Arlington, Keller, Hurst, Bedford, Euless and North Richland Hills.
If every key is already gone, start at lost car keys in Fort Worth — and on a QX30 specifically, call before arranging a tow anywhere, because where the vehicle needs to go depends on an answer we can give you from the VIN.
Frequently Asked Questions
Is an Infiniti QX30 key the same as other Infiniti keys?
No. The QX30 was built on a Mercedes-Benz platform with Mercedes-derived electronics, including its key system, so it does not follow the Infiniti Intelligent Key path that a QX50, QX70 or Pathfinder follows. It prices and programs like a European luxury vehicle rather than a Nissan-family one.
How much does an Infiniti QX70 key cost in Fort Worth?
It prices in the smart proximity fob band, $220 – $450 as of September 2026, with the emergency blade cut included. If every key is lost, add the published $50 – $200 all-keys-lost surcharge.
How much does an Infiniti QX30 key cost?
It prices against the luxury and European band, $300 – $700+ as of September 2026, because the part is a Mercedes-family key rather than an Infiniti one. The exact figure and whether the job is workable outside a dealer are both VIN-dependent, which is why we ask for the VIN before quoting.
Can a locksmith program a QX30 key, or do I need the dealer?
With a working key in hand, a spare is often workable. With no working keys, a QX30 frequently routes to the dealer because of the era of Mercedes key architecture it uses. We check by VIN and tell you honestly which case yours is rather than quoting first and discovering later.
What is the difference between an Infiniti FX and a QX70?
They are the same vehicle. Infiniti renamed the FX to QX70 after the 2013 model year, so a 2014 to 2017 QX70 and the later FX models share architecture and key family. Parts counters often still ask for it by the old name.
Do I need to be present with the vehicle for Infiniti key programming?
Yes, with the vehicle and with proof of ownership — registration or title plus matching photo ID. The vehicle must be present for any immobilizer work, which is why this service is mobile rather than something done at a counter.
Does the replacement fob include cutting the emergency key?
It should, and we include it. Both the QX30 and QX70 fobs carry a mechanical emergency blade for when the 12-volt battery is flat and the proximity system has no power. A fob programmed but never cut leaves you locked out at exactly the moment the blade exists for.
Can I supply my own fob and pay only for programming?
Sometimes, and on the QX70 it is often a real saving. Match the FCC ID and part number exactly and check with us first, because some fobs are permanently committed to the first vehicle they were paired with. On the QX30 the sourcing question is narrower and worth asking before you buy anything.
Send Us the VIN First
On these two vehicles the VIN is not a formality — it is the question.
Call or text 817-674-2304 with your VIN, your year and whether you still have a working key. We will tell you which of these two jobs you have, what it costs, and if yours is one of the cases that genuinely belongs at a dealer, we will say so rather than send a van.
Article written by the Fortworthlocksmithexperts Automotive Locksmith Team. For mobile automotive locksmith service throughout Fort Worth and Tarrant County, contact us at 817-674-2304.
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