Mazda CX-90 & CX-70 Smart Key Replacement — Keller TX

Mazda's large-platform SUVs are new enough that a lot of what people read online about "Mazda keys" simply does not apply to them. The CX-90 and CX-70 are not scaled-up CX-5s underneath, and the honest version of this article says so up front rather than quoting you a price built for a different vehicle. Call or text (817) 968-3866.

Quick Answer

A smart key for a Mazda CX-90 or CX-70 in the Keller area typically runs $320–$550 when you still have a working key, and $450–$700 when all keys are lost — with the firm number confirmed against your VIN before a technician is dispatched. These are current-generation vehicles, and we check the specific configuration rather than assuming.

Keller Pricing

Ranges only, as of August 2026. On a platform this new, the VIN check is not a formality.

Service	Typical range
Spare smart key, working key present	$320–$550
Smart key, all keys lost	$450–$700
Emergency blade cut only	$85–$155
Second key added at the same visit	$220–$360 extra
Fob shell replacement, electronics reused	$80–$150
Immobilizer / no-start diagnosis	$95–$180
Purge a lost or stolen key from memory	Usually bundled

What Is Actually Different About These Two

The CX-90 arrived as Mazda's flagship three-row on an all-new rear-biased architecture, and the CX-70 followed as the two-row variant of the same platform. From a key-and-security standpoint, three things follow.

Newer immobilizer architecture. These vehicles do not share the key system of the CX-5 and Mazda3 generation that most online guides were written about. Advice that is perfectly accurate for a 2018 CX-5 can be wrong here.

Proximity entry is standard equipment. There is no turn-key base trim to fall back on. Everything is a smart key with push-button start, which means every replacement is a registration procedure rather than a cutting job — though the fob still hides a mechanical emergency blade for when the battery dies.

Hybrid and plug-in variants add a wrinkle. On electrified trims, "the car will not start" has more possible causes than on a conventional drivetrain, and the 12V system deserves checking before anyone sells you a key.

The Emergency Blade Nobody Knows About

Worth its own section because it saves people from tow trucks.

Inside your CX-90 or CX-70 fob is a small mechanical key. It slides out, usually via a release catch on the fob body. That blade opens the driver's door when the fob's coin cell has died or the vehicle's 12V battery is flat.

Most owners discover this blade exists on the day they need it, in a parking lot, in the rain. Take thirty seconds now: find the release, pull the blade out, look at it, put it back. Also check the driver's door handle for a covered keyhole — on many modern vehicles it hides behind a small cap that pries off.

Note that the blade opens the door. It does not start the car. Most push-button vehicles have a backup start method using the fob held against a specific location in the cabin — your owner's manual documents it for your exact model, and it is worth reading before you need it.

Common Situations We See

One key, brand-new SUV

Extremely common on any vehicle bought in the last few years, especially where a second key was quietly treated as an upsell at delivery. A CX-90 with a single fob is a $700 problem waiting for a bad day at the soccer fields. A spare programmed now, while the first key works, is roughly half of that.

Fob range dropping off

Coin cell first, always. Proximity range shrinking is the classic early symptom of a battery on the way out, and it is a few dollars to eliminate. If range is still poor with a fresh battery, the fob may be failing — the right moment to add a spare, not to wait.

The 12V battery died and the SUV is unresponsive

This is not a key failure and a new key will not fix it. Use the emergency blade to get into the cabin and sort the 12V system. On hybrid trims especially, a marginal 12V battery produces a convincing impression of a dead key. We check it before we sell anything.

A fob went through the wash

More common than you would think. Water damage can kill a fob outright or make it intermittent. If you still have a second working key, this is a routine replacement. If that was your only key, it is an all-keys-lost job — and a good argument for the spare.

All Keys Lost on a CX-90 or CX-70

With no working credential, the vehicle has nothing to authenticate against, so the process becomes a security procedure:

• Proof of ownership is mandatory. Photo ID plus registration, title, or insurance showing the same VIN and a matching name. There is no version of this we can skip.
• The appointment runs longer than a spare, and on many modern platforms the vehicle enforces its own security timing during registration.
• The emergency blade is cut to your VIN rather than copied from an original.
• Ask for a key purge if a fob was stolen rather than misplaced, so the missing one stops working.

The Honest Boundary

This is the part of the article that matters most on a platform this new.

We confirm your specific vehicle before quoting firmly. On a 2024-and-newer Mazda large-platform SUV, we ask for the VIN and have a technician verify the configuration. If your particular build turns out to be a dealer-only procedure, we will tell you that on the phone — not after collecting a trip charge in your driveway.

We do not claim every late-model vehicle is mobile-serviceable. Manufacturers keep tightening key security, which is good for owners and occasionally inconvenient for everyone. Anybody promising a flat price on any new vehicle sight-unseen is telling you what you want to hear.

Older Mazdas are a different article. If you actually have a CX-5, CX-9, or Mazda3, the answers change — see our Mazda immobilizer key guide and our Mazda3 duplication and spare-key guide instead.

How the Keller Appointment Works

We come to the vehicle — driveway, office lot, or wherever it is parked. Coverage runs across Keller 76248, Southlake, Colleyville, Grapevine, Watauga, Haslet, Argyle, Justin, North Richland Hills, and the surrounding Tarrant and Denton County communities.

Have the VIN handy when you call. On this platform it is the difference between a real quote and a hopeful one.

Frequently Asked Questions

How much is a Mazda CX-90 key replacement?

Roughly $320–$550 for a spare with a working key present, and $450–$700 when all keys are lost, as of August 2026 — confirmed against your VIN before dispatch.

Is the CX-70 key the same as the CX-5 key?

No. The CX-70 and CX-90 sit on Mazda's newer large platform with different key architecture than the CX-5 generation, so advice written for a CX-5 does not reliably transfer.

Can a locksmith program a CX-90 key, or is it dealer-only?

Many configurations are mobile-serviceable, but on a platform this new we verify against the VIN first and tell you honestly if your build requires a dealer.

Where is the emergency key in a Mazda smart fob?

It slides out of the fob body via a release catch, and it opens the driver's door when the fob battery or the vehicle's 12V battery is dead. It does not start the engine.

My CX-90 will not start and the key seems fine — what now?

Check the 12V battery before assuming a key fault, especially on hybrid trims. A weak 12V system reproduces nearly every symptom of a dead key.

Should I buy a second key even though mine works?

Yes, and it is the cheapest version of this job. A spare programmed while your first key works costs roughly half of an all-keys-lost replacement and takes a fraction of the time.

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Need a CX-90 or CX-70 key in Keller, Southlake, or Grapevine? Call or text Keller Locksmith at (817) 968-3866 with your VIN and we will confirm the job before anyone drives out.

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Written by the Kellerlocksmith Automotive Locksmith Team — mobile automotive locksmiths serving Keller, Southlake, Colleyville, Grapevine, and the surrounding Tarrant and Denton County communities.