Key Fob Stolen high urgency

Key Fob Stolen? What to Do for a 2024 Mazda CX-50 (US)

If your 2024 Mazda CX-50 key fob was stolen, treat it as both a theft and a vehicle-security issue. Your priority is to prevent the stolen fob from starting the vehicle and to restore access with newly programmed keys.

Understanding Your Situation

A stolen smart key (key fob) may still be able to unlock and start your CX-50 until the vehicle’s system is updated to erase (disable) that key and register replacement fobs. Because the fob is paired to the car, replacing the battery or changing door locks alone typically won’t stop the stolen fob from working.

🚀 Immediate Steps to Take

  1. Confirm the vehicle is secure: move it to a locked garage or well-lit monitored area if possible, and remove valuables. If you suspect the fob was stolen with identifying info (address/registration), consider relocating the vehicle temporarily.
  2. File a police report and document details (date/time/location, any surveillance, serial numbers if you have them). Contact your insurance (comprehensive) and ask what documentation they require for key replacement and reprogramming.
  3. Arrange key deletion and replacement programming ASAP: contact a Mazda dealer or a qualified automotive locksmith with Mazda smart-key capability and request that all lost/stolen keys be erased from the vehicle and new keys registered.

Your Options

Mazda dealer: erase stolen key(s) and program new smart key fobs

Cost: $350-$900+ Time: Same day / 1-3 days (depending on key stock and scheduling)

The dealer verifies ownership, connects factory diagnostic equipment, deletes all missing/stolen keys from the vehicle, and registers new smart keys. They can also cut any included emergency key blade if applicable and confirm remote functions.

âś“ Pros:
  • Factory-correct programming and security procedures
  • Clear documentation for insurance claims
  • Access to OEM key fobs and parts availability
âś— Cons:
  • Often the highest cost option
  • May require towing if no working key is available
  • Appointment and parts delays are possible

Mobile automotive locksmith: delete lost keys and program replacement fobs

Cost: $250-$700 Time: Same day / 1-2 days

A qualified locksmith comes to the vehicle, verifies ownership, uses professional programming tools to erase the stolen key(s), and programs new compatible smart key fobs on-site. Some can supply OEM or high-quality aftermarket fobs depending on availability.

âś“ Pros:
  • Convenient on-site service (often avoids towing)
  • May be faster than a dealer for urgent situations
  • Can be less expensive than dealer pricing
âś— Cons:
  • Capability varies by locksmith and by model year/trim
  • Aftermarket fobs (if used) may have quality/warranty differences
  • You must verify licensing, reviews, and proof-of-ownership process

Insurance claim (comprehensive): reimbursement for key replacement and reprogramming

Cost: $0-$500+ out-of-pocket (depends on deductible/coverage) Time: 1-7 days (varies by insurer; replacement service may be same day)

If your policy covers stolen keys, insurance may reimburse part or all of the cost to replace and program new fobs (minus deductible). You’ll typically need a police report and receipts from the dealer/locksmith.

âś“ Pros:
  • Can significantly reduce out-of-pocket cost
  • Creates a documented record of theft and remediation
  • May include towing/rental coverage depending on policy
âś— Cons:
  • Deductible may exceed the cost of replacement
  • Claims can affect premiums depending on insurer/state
  • Reimbursement timing may lag behind the repair

Additional security measures while waiting (temporary risk reduction)

Cost: $30-$300 Time: Same day

Use layered deterrents until the stolen key is erased: steering wheel lock, secure parking, cameras, and (if available) vehicle tracking/connected services. This does not replace key deletion/programming, but reduces theft risk.

âś“ Pros:
  • Immediate added deterrence
  • Low cost and widely available
  • Helpful even after new keys are programmed
âś— Cons:
  • Does not disable the stolen fob
  • May be inconvenient to use daily
  • Not a substitute for professional reprogramming

⚠️ What to Avoid

✕ Don’t assume replacing the key fob battery or changing the physical door lock will stop the stolen fob from starting the vehicle—key deletion/reprogramming is the critical step.

✕ Don’t buy random online fobs without confirming compatibility and return policy; incorrect part numbers and locked/used fobs are common issues.

✕ Don’t delay key deletion if the theft included your address, registration, or garage access—treat it as urgent and reduce where the vehicle is parked.

⚠️ Common Mistakes to Avoid

  • Not deactivating stolen key
  • Delaying reprogramming
  • Not filing police report
  • Ignoring security risk

Frequently Asked Questions

Can a stolen key fob still start my 2024 Mazda CX-50?

Yes. If the stolen smart key is still registered to the vehicle, it can typically unlock and start the car until the vehicle’s system is updated to erase that key and register replacement keys.

Do I need to replace the locks if my key fob is stolen?

Usually not for push-button start security. The priority is to erase the stolen key from the vehicle’s memory and program new keys. Lock replacement may be considered if a physical key blade was stolen and you’re concerned about mechanical entry, but it’s separate from immobilizer/smart-key authorization.

Will my CX-50 need to be towed to the dealer if all keys are gone?

Sometimes. Some dealers require the vehicle on-site for programming, and some locksmiths can perform all-keys-lost programming at the vehicle. Call ahead—requirements vary by provider and equipment.

How many keys should I program after a theft?

Ideally program at least two working keys/fobs (a primary and a spare). During the service, ask the provider to confirm that all missing/stolen keys were removed from the system.

What proof do I need to get a replacement key programmed?

Expect to show a government-issued ID and proof of ownership (registration/title). Reputable dealers and locksmiths will require this before cutting/programming keys.

⏱️ Urgency Note: High urgency: a stolen, still-registered smart key can allow immediate vehicle access and starting. Arrange key deletion/reprogramming as soon as possible and reduce exposure by securing or relocating the vehicle in the meantime.

Related Information

Need Detailed Information?

Get vehicle-specific key fob compatibility, part numbers, and a complete price comparison for your 2024 Mazda CX-50.

View CX-50 Key Fob Guide →

Last updated: 2026-01-04