2005 Acura MDX
Low-Price Key Made at Your Location in Ventura County

Q: What kind of key does a 2005 Acura MDX use?

It uses a traditional metal ignition key with a built-in transponder chip, plus a separate remote for locks and panic. The blade style is HD106. The chip inside is a Megamos ID13 fixed-code type used in Acura’s Type 3 immobilizer system. The remote commonly carries FCC ID E4EG8D-444H-A and part numbers like 72147-S3V-A01 or A02, depending on memory seat configuration. A perfectly cut key without programming will crank but will not start. The green key indicator will blink to let you know the immobilizer rejected it.

Q: How long does the dealer take to replace this key?

Programming itself only takes minutes. The visit is what stretches out. Dealers often require the vehicle on site, VIN verification, and sometimes ordering a cut key by code. Separate appointments for cutting and programming are common. For related ignition concerns, Acura recall 12V-573 and Service Bulletin 13-005 even advised owners to leave the vehicle for half a day, though the actual repair time was listed around 30 to 54 minutes. That gap between clock time and shop time is what most owners notice.

Q: Why did my MDX remote stop working after programming another one?

Because that is how this system works. When you enter remote programming mode on a 2005 MDX, the keyless receiver wipes its memory. It can store up to three transmitters, but every remote has to be programmed during the same session or it gets erased. I see this when someone adds a used fob and forgets to reprogram the original. The fix is simple. Gather every remote you want to keep and relearn them together in one cycle.

Q: My MDX cranks but the green key light keeps blinking. What does that mean?

Blunt answer. The immobilizer is not recognizing the transponder. On this generation MDX, the green key indicator should come on for about two seconds, then go out. If it keeps blinking and the engine only cranks, the chip was not accepted. That can be a bad or unprogrammed key, a damaged chip, or a problem with the immobilizer antenna ring around the ignition, part number 39730-S3V-A01. Start by trying a second key with nothing else on the key ring. If it still blinks, it needs proper diagnosis.

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2005 Acura MDX
Key Options

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Remote

Pairs With Key

FCC IDE4EG8D-444H-APart #72147-S3V-A02Buttons3BatteryCR2025Frequency308 MHzRemote StartNo

✓ In Stock · Programmed On-Site

Transponder Key

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Key BlankHD106-PTPart #BHD106-PT

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Mechanical Key

Budget

Surf Key

Key BlankHD103TypeEmergency Blade

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2005 MDX is first generation and runs a Type 3 Honda immobilizer with a Megamos ID13 fixed-code chip in an HD106 blade key, often sold as BHD106-PT. If the green key indicator on the dash blinks and it just cranks, the car is not seeing the chip. The 2005 MDX owner’s manual even warns that another immobilizer key or metal object near the ignition can block recognition. Pull extra keys off the ring and try again.

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2005 Acura MDX Transponder Key Replacement - Fast, Affordable & Professional

I was out in Oxnard, parked near Seabridge Marketplace, cutting a spare for a 2005 Acura MDX. First generation truck. Good shape. Just one worn key and a separate remote that only worked when it felt like it.

This year uses an edge-cut HD106 blade with a Megamos 13 chip inside. No push button start. No proximity. Old school ignition cylinder with a green key light that tells the truth.

I decoded the door, cut a fresh BHD106-PT, and programmed it through the immobilizer with my diagnostic tool at the OBD port. Type 3 system. Fixed code. Add key procedure through the immobilizer control unit.

Her remote was the OEM style, FCC ID E4EG8D-444H-A, part number 72147-S3V-A02, running on 308 MHz with a CR2025 inside. I re-synced it and made sure all transmitters were learned at the same time since this system erases old ones when you enter programming mode.

She stood there watching the dash. Key in. Green light on for two seconds. Then out. Clean start.

Dealer route would have meant leaving it and juggling parts, labor, and programming as separate line items. Instead, it was done in one visit, right there in the parking lot.

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2005 Acura MDX

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E

Esteban S.

Dec 2025

★★★★★

“My Chevy key snapped while I was running errands in North Oxnard. He removed the broken piece from the ignition, cut a new blade, programmed the transponder, and tested everything thoroughly. The whole job was smooth and professional. Best automotive locksmith I have used.”

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Dan G.

Mar 2024

★★★★★

“They responded instantly, showed up within an hour, and arrived exactly when they said they would. Made a copy and programmed a fob for my 2014 car with a worn ignition in about 15 minutes. The new key works perfectly and feels like a dealer key.”

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Dec 2025

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Acura MDX Service at Your Location FAQ

Your key replacement cost breakdown

Do I have to go to the dealer for a 2005 MDX key?▼

No. The 2005 Acura MDX uses a Type 3 immobilizer system that can be accessed through the diagnostic port with professional equipment. I cut the HD106 key on site and register the transponder directly to the immobilizer control unit. If all keys are lost, the system is initialized and new keys are learned in one session. You still need proof of ownership, same as the dealer, but you do not need to tow it across town or leave it for half a day.

What kind of key does a 2005 Acura MDX use?▼

How long does the dealer take to replace this key?▼

Why did my MDX remote stop working after programming another one?▼

My MDX cranks but the green key light keeps blinking. What does that mean?▼

Questions? Call (805) 790-8162