2024 Mazda CX-90 Key Replacement

2024 CX-90 key specs

Every CX-90 uses push-button start and a smart fob with lock, unlock, liftgate and panic buttons. The fob's lower cover slides off to hold the auxiliary key and a CR2032 cell, and the auxiliary key opens the driver's door if the fob or 12-volt battery is dead. If two drivers share the vehicle and each carries a fob, a single lost fob leaves the household with no spare at all, which is the best time to add one before the second goes missing.

What's specific to the 2024 CX-90

2024 was the first model year of the CX-90 First generation. Early-production cars sometimes use different part numbers than later ones, so for a 2024 Mazda CX-90 we confirm the exact key from the VIN or the old key's FCC ID before cutting anything.

At 2 years old, a 2024 Mazda CX-90 is usually still on its original keys and fob batteries. The most common call for a car this new is a second key, since many buyers leave the dealer with only one, or a replacement after a lost fob.

Key options for the 2024 Mazda CX-90

• Smart proximity key (push-to-start). Making a new smart key is mostly a programming job. The fob has to match the vehicle's FCC ID, frequency and chip, and then the keyless system must be told to accept it, normally through the OBD-II port. Depending on the platform, that can mean entering a PIN, waiting through a timed security procedure, or on some newer vehicles, using manufacturer online access. When every key is lost, certain models need a module removed and read on the bench. For your Mazda CX-90 First generation, we'll tell you which of those applies, and if a step is dealer-only, you'll hear it before we drive out. The emergency blade hidden inside the fob is cut by code during the same visit.

How the Mazda immobilizer works on the CX-90

Mazda key systems fall into a few clear eras, and knowing which one your car belongs to tells us most of what the job involves. Around 2000, Mazda fitted a stand-alone immobilizer control unit to the MPV, V6 versions of the 626 and many Miatas. The transponder in the key talks to that unit through a coil around the ignition, and the unit then passes a code word to the engine computer. Ford-built models, the Tribute and the B-Series pickup, used Ford's PATS instead. From the 2003 Mazda6 through about 2015, Mazda settled on Texas 4D63 transponders on the MAZ24R blade, first 40-bit and later 80-bit, with flip keys on most cars and an optional advanced key that started the engine with a twist knob or a START/STOP button. The 2013 CX-5 and 2014 Mazda3 moved the lineup to push-button start with NXP Hitag Pro fobs that hide a small emergency blade. Starting with the 2019 Mazda3, and across most models by 2021, fobs switched to AES encryption and a thicker CR2032 battery. Each step made the cars harder to steal and narrowed what can be done without a PIN or dealer software.

• For the 2024 launch, Mazda dealers had to request CX-90 key codes and immobilizer incodes through a temporary manual process.
• The CX-90 uses the four-digit door lock code and bar-code tag format introduced on the CX-50.
• With a dead fob battery, the auxiliary key opens the driver's door, and the fob held near the START/STOP button lets the engine start.

Getting a 2024 CX-90 key from the dealer

Mazda's dealer procedure registers CX-90 fobs through MDARS using two outcodes and two incodes. Outside the dealer, programming coverage for this model is limited and changes often, so we verify ownership, check your VIN, and tell you plainly which route your vehicle needs before any parts are ordered. We can still help with entry, lockouts and cutting the auxiliary key.

Mazda's own procedure needs dealer software and a two-part code. We help with lockouts and auxiliary keys and coordinate dealer programming; if tool coverage opens up for your VIN, we say so.

How we help when the key must come from Mazda

Losing every key to a Mazda is fixable, but the route depends on the year. On transponder-key cars, we decode the driver's door lock to cut a working blade, erase the old keys from the immobilizer, and program at least two new keys in the same session so a lost key can't start the car. Push-button Mazdas need a new fob plus its emergency blade, and because Mazda tightly controls the cutting code for that blade, decoding the lock is usually faster than waiting on a code. For 2020-and-later fobs, and for the CX-70 and CX-90, Mazda's own procedure for a car with no working transmitter runs through dealer software. Some aftermarket equipment covers certain Mazda3 and CX-30 years with a PIN, but coverage varies, and we will tell you up front if yours is one that has to go to the dealer. Expect to show ID and proof of ownership first.

1. Get you back into the car. If the car is locked, we open it on site without damage, so you can reach the registration, the VIN plate and anything you need inside.
2. Line up the dealer order. We help you gather what the Mazda dealer will ask for: the VIN, current registration or title, and photo ID in the owner's name. That avoids a second trip.
3. Keep the car where it is if possible. Ask the dealer whether the key can be programmed with the car in place or whether it needs to be towed in. Some brands deliver a pre-coded key; others must program it at the vehicle.
4. Plan for a spare. Once you have a working key, order a second one. Losing the only key on a dealer-only system is the slowest and most expensive situation to recover from.

Why the 2024 CX-90 needs a dealer key

On the 2024 CX-90, the immobilizer and the keyless system trust only keys that Mazda's own system has authorized for that VIN. Programming happens through a secure online connection, and the key itself is usually ordered with the car's security data already written to it. Independent locksmith equipment is very capable on most vehicles, but on dealer-only generations like this one the honest answer is that the factory has to be involved. Being upfront about that saves you the cost of a wasted service call.

What to bring to the dealer

Before you call the dealer, collect three things: proof of ownership (registration or title), photo ID with the same name, and the 17-character VIN. Write down which keys you still have and whether any of them still start the car. That one detail changes the order, the price and whether the car has to be at the dealership for programming.

While you wait for the new key

While the dealer key is on order, protect what you have. If one key still works, keep it indoors and away from the car, and don't hand it to anyone you wouldn't trust with the car itself. If the car is locked with belongings inside, we can open it without damage. If the key has a mechanical emergency blade, ask us about cutting a spare blade by code so you can at least lock and unlock the doors.

What affects the dealer's price for a CX-90 key

Expect the dealer's quote to include the key itself, a programming or setup charge, and sometimes a separate charge for cutting an emergency blade. If every key is lost, add the cost of getting the car to the dealership. Comparing two dealers is worth a phone call; programming charges vary more than the price of the key.

Avoid doing this twice

Once you have a working key for your 2024 CX-90, order a second one while the car's information is already on file. On dealer-only systems, adding a key while one still works is simpler, faster and cheaper than replacing every key after a loss. Keep the spare somewhere you can reach quickly, not in the car, and note where you stored it.

CX-90 key battery

Most fobs for a 2024 Mazda CX-90 open along a small slot in the seam; a coin or a plastic pry tool works better than a screwdriver, which chews up the housing. If the fob hides a mechanical blade, slide it out first, since the case often opens from that gap. Note which side of the old cell faces up, swap in a fresh CR2032, and press the halves together until they click all the way around. Handle the new battery by its edges, because skin oil on the faces can hurt contact. In most cases the fob keeps its programming through a battery change, so test lock, unlock and start, and you're done.

Common Mazda key problems

• Retractable flip keys from roughly 2004 to 2015 wear out at the pivot: the blade wobbles, won't lock open, or folds under pressure. The circuit board is usually fine, so a new shell and freshly cut blade often solve it.
• Some 2001-2002 Miatas crank without starting because of an immobilizer or PCM fault covered by recall 3505H. Mazda stopped completing that recall in July 2020 when parts ran out, so repairs now take sourcing.
• A fob left in the cup holder or a metal-lined console tray may not be detected. Mazda's own quick-start guides call the cup holder a dead zone, and a red KEY light usually clears once the fob is moved.
• Inland Empire summer heat shortens coin-cell life. A flashing green KEY indicator on smart-key Mazdas is the low-battery warning, and replacing the cell then beats having the fob quit in a parking lot.
• Many newer Mazdas hide the driver's lock under a handle cap, and if both small auxiliary keys are lost, Mazda calls for code cutting on its approved key machines. Decoding the lock is often the quickest fix.

Tips from a mobile locksmith

• Southern California heat is hard on keys. Fob batteries drain faster, plastic housings turn brittle, and rubber button pads crack when a key spends summer afternoons on a dashboard or in a sunny cup holder. Carry the fob with you or keep it shaded, and replace batteries before summer rather than after they fail.
• Every so often, use the mechanical blade in the driver's door lock. Cylinders that go years without a key can seize from dust and dried grease, and you won't find out until the day the fob dies and the blade is your only way in. A small shot of dry lubricant keeps the lock ready.
• When a key's head cracks or its blade bends, replace it before it fails. A transponder chip can slip out of a split head, and a bent blade can break off inside the ignition or door lock, turning a simple key replacement into an extraction and repair job. Small symptoms are the inexpensive time to act.

Proof of ownership

Making car keys is regulated work in California. Locksmiths are licensed and overseen by the Bureau of Security and Investigative Services under the Locksmith Act, Business and Professions Code section 6980 and following, and Julian's Locksmith holds company license LCO7891. Verification protects you more than anyone: a locksmith who will make a key for whoever asks will also make one for someone who wants your car. We record your name, the vehicle and its VIN on a work order, and we politely decline jobs where ownership can't be established. You can look up our license at search.dca.ca.gov.

Need a 2024 Mazda CX-90 key?

Call Julian's Locksmith at (951) 903-3193 if you're locked out of a 2024 Mazda CX-90 or need help preparing a dealer key order. We'll tell you plainly what we can do on site and what has to go through Mazda.