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Lost Key Fob for a 2024 Acura MDX (US): What to Do Next

Losing a key fob for a 2024 Acura MDX can leave you stranded and can also be a security concern if the fob was lost near the vehicle or with identifying info. The good news: Acura dealers and qualified automotive locksmiths can replace and program a new fob, and the missing fob can be disabled.

Understanding Your Situation

A 2024 Acura MDX uses a proximity “smart key” fob for keyless entry and push-button start. When the fob is lost, the vehicle may still be drivable if you have a spare, but the missing fob can potentially be used to access or start the vehicle if it’s found by someone nearby—so disabling it and adding a new fob is the safest path.

🚀 Immediate Steps to Take

  1. Confirm it’s truly lost: check common spots, bags, coat pockets, and use any key-finder app/tag if attached. If you have a spare fob, keep it with you (not in the vehicle).
  2. Secure the vehicle: park in a well-lit area, lock it, remove valuables, and if you suspect the fob was stolen (or lost with your address), consider moving the MDX to a secure location if you can do so safely.
  3. Plan replacement and disablement: contact an Acura dealer (or a reputable automotive locksmith that supports late-model Acura smart keys) and request programming that removes the lost fob from the vehicle’s memory.

Your Options

Acura dealer replacement (new OEM smart key + programming)

Cost: $350-$700 Time: Same day to 1-3 days

The dealer supplies an OEM Acura smart key fob and programs it to your 2024 MDX. They can also erase/disable the lost fob during the programming process. You’ll typically need proof of ownership and identification.

âś“ Pros:
  • OEM parts and correct programming for the 2024 MDX
  • Dealer can reliably disable the missing fob
  • Good option if all keys are lost
âś— Cons:
  • Often the highest cost
  • May require towing if you have no working key and the dealer can’t dispatch help
  • Appointment/parts availability can delay service

Mobile automotive locksmith (smart key replacement + programming)

Cost: $250-$600 Time: Same day

A qualified mobile locksmith comes to the vehicle, provides a compatible smart key fob, and programs it on-site. Many can also remove the lost fob from memory, depending on equipment and vehicle configuration.

âś“ Pros:
  • Convenient on-site service (often no tow needed)
  • Usually faster and may cost less than the dealer
  • Helpful if you’re stranded away from home
âś— Cons:
  • Not all locksmiths can program very new Acura models
  • Quality varies—must verify licensing, reviews, and warranty
  • Some aftermarket fobs may have shorter range or durability than OEM

Use your spare key now, then add a replacement (recommended if you still have one working fob)

Cost: $200-$700 Time: Same day to 1-3 days

If you have a spare, you can continue driving while arranging a replacement. The safest approach is to add a new fob and have the lost one deleted from the system so it can’t be used if found.

âś“ Pros:
  • Avoids towing and reduces immediate disruption
  • Lets you shop around for the best service option
  • Restores having at least two working fobs
âś— Cons:
  • Vehicle remains at some risk until the lost fob is disabled
  • Easy to postpone and end up with only one working key long-term

Insurance/roadside assistance support (if applicable)

Cost: $0-$700 Time: Same day to 1-7 days (depends on reimbursement)

Some auto insurance policies, extended warranties, or roadside plans may reimburse part of key replacement or cover towing/lockout. You still need a dealer or locksmith to cut/program the smart key.

âś“ Pros:
  • May reduce out-of-pocket cost
  • Roadside may help with towing if all keys are lost
âś— Cons:
  • Coverage varies widely; may have limits/deductibles
  • Reimbursement can take time and requires receipts/documentation

⚠️ What to Avoid

✕ Don’t buy a random online fob expecting simple DIY programming—most 2024 smart keys require specialized tools and pairing procedures.

✕ Don’t leave the MDX unattended in an unsecured area if you suspect the fob was stolen or lost with identifying information (address, registration photos, etc.).

✕ Don’t postpone disabling the missing fob—if it’s found, it may still unlock/start the vehicle until it’s removed from the system.

⚠️ Common Mistakes to Avoid

  • Calling dealer first without getting quotes
  • Not checking insurance coverage
  • Rushing to tow to dealership
  • Not considering mobile locksmiths

Frequently Asked Questions

Can someone start my 2024 Acura MDX if they find my lost fob?

Potentially, yes—if the fob is still authorized to the vehicle and is close enough, it can unlock doors and enable push-button start. The best mitigation is to have the lost fob erased/disabled and a new fob programmed.

Do I need to tow my MDX to the dealer if I lost my only key fob?

Sometimes. Many dealers require the vehicle present for programming, and if you have zero working keys, towing may be necessary unless a mobile locksmith (or dealer mobile service, where available) can program on-site. Call ahead with your VIN to confirm options.

What do I need to get a replacement key fob made?

Typically: a government-issued photo ID and proof of ownership (registration/title). Dealers and reputable locksmiths may also ask for the VIN and may verify the address on your documents.

Will an aftermarket key fob work the same as OEM?

It depends on the fob and programming. Some aftermarket fobs work well, but others may have reduced range or longevity. For the newest models like the 2024 MDX, OEM is often the most reliable choice.

⏱️ Urgency Note: If the fob was lost near your vehicle, stolen, or lost with any identifying info (address, documents), treat it as urgent: secure the MDX and arrange to disable the missing fob as soon as possible.

Related Information

Need Detailed Information?

Get vehicle-specific key fob compatibility, part numbers, and a complete price comparison for your 2024 Acura MDX.

View MDX Key Fob Guide →

Last updated: 2026-01-04