Acura Key Replacement

How Acura keys and immobilizers work

Acura fitted an immobilizer to essentially every car it sold here from 2000 on, and the type of chip tells you a lot about how a replacement key gets made. Through the early 2000s, the TL, CL, RL, MDX, RSX, NSX and 2000-2001 Integra used a Megamos 13 fixed-code transponder inside a conventional key, with keyless entry handled by a separate remote. The 2004 TL and TSX introduced Philips ID46 (Hitag 2) crypto chips, which later moved into flip keys on the MDX, RDX, TL and TSX. The 2005 RL brought Acura's Keyless Access smart key, and by the late 2010s nearly every Acura used push-button start with a Philips ID47 (Hitag 3) smart fob. The newest designs, such as the 2022-and-later MDX and RDX, the 2023 Integra and the ADX, use Honda's latest smart key generation, while the electric 2024 ZDX uses a GM-designed system. In every case the engine computer checks the chip before it lets the engine run, so a key that is only cut will turn the ignition without starting the car. A flashing key symbol on the dash usually means the car didn't recognize the chip.

Acura key programming

Most Acura key programming happens through the OBD-II port under the dash with a professional key programmer. There's no owner-side procedure for the immobilizer chip, although the separate keyless entry remotes used from about 2000 to 2008 can usually be paired on board with Honda's timed ignition-and-lock-button routine. Flip keys and smart keys get their remote functions registered along with the chip. Two habits save trouble. First, bring every key you still use, because Honda's registration routine can drop keys that aren't present. Second, check the FCC ID and part number on your current fob, since Acura fobs run on several frequencies (308, 312, 314, 315 and 434 MHz) and many come in Driver 1 and Driver 2 versions tied to seat memory. Laser-cut blades are cut to code on a dedicated machine. We verify your ID and proof of ownership before any key is made.

All Acura keys lost

Losing every key to an Acura is usually fixable where the car sits, but the path depends on the year. For cars with Megamos 13 or ID46 chips, roughly 2000 to 2013 including the flip-key models, we cut a key to your locks by code or by decoding a lock, then program it to the immobilizer through the OBD-II port. Most push-button models from about 2009 to 2020 follow the same pattern with a new smart fob, though low-volume cars like the RL, RLX and first ZDX can take extra steps. The newest platforms, such as the 2022-and-later MDX and RDX, the current Integra, the ADX and the 2021-2025 TLX, depend on current tool coverage, while the hybrid NSX and electric ZDX are dealer jobs. Before anything is cut, we check your photo ID against the registration or title.

Acura models we cover

• ADX (2025–2026). The ADX is Acura's smallest crossover, introduced for the 2025 model year and built in Mexico alongside the Honda HR-V. It uses a turbocharged 1.5-liter four-cylinder with a CVT, offers front- or all-wheel drive, and sits below the RDX in the lineup. The ADX starts with a push button and a smart key, so a replacement is always a programmed fob rather than a cut key. Because the model is so new, we check part numbers and programming coverage against your VIN before quoting.
• CL (2001–2003). The second-generation CL was Acura's V6 luxury coupe, sold for the 2001 through 2003 model years and built in Marysville, Ohio, on underpinnings shared with the TL sedan. Acura skipped the 2000 model year between the first and second generations, so there is no 2000 CL. Both the 3.2 CL and the higher-output Type-S use a chip key with a Megamos 13 transponder and a separate four-button remote, so replacing everything usually involves two pieces: the cut chip key and the remote.
• ILX (2013–2022). The ILX was Acura's entry-level compact sedan for the 2013 through 2022 model years, built on the Civic platform of its time. It launched with 2.0-liter, 2.4-liter and hybrid versions, then switched to a single 2.4-liter engine with an eight-speed dual-clutch transmission for the 2016 refresh. Every ILX starts with a push button and a smart key, but the fob and its transponder changed with that refresh, so the model year decides which key you need.
• Integra (2000–2026). Acura has sold two very different Integras in this range. The third-generation coupe and sedan ended with the 2001 model year, when the RSX took its place. The name returned for 2023 on a five-door liftback built in Marysville, Ohio, sharing its platform with the 11th-generation Civic, with a turbocharged 1.5-liter engine and, from 2024, the 320-horsepower Type S. The older cars use a chip key with a separate remote, while the new ones use push-button smart keys.
• MDX (2001–2026). The MDX is Acura's three-row SUV and one of its best-known nameplates, sold since the 2001 model year. Four generations fall between 2001 and 2026, and Acura skipped the 2021 model year before launching the fourth generation as a 2022 model. Key technology changed with almost every redesign: chip keys with separate remotes on the first generation, flip keys on the second, and push-button smart keys from 2014 on, including the Sport Hybrid and Type S versions.
• NSX (2000–2022). The NSX is Acura's mid-engine sports car. The original aluminum-bodied NSX was sold through the 2005 model year, and the second generation, a twin-turbo V6 hybrid with three electric motors, was built at the Performance Manufacturing Center in Marysville, Ohio, for the 2017 through 2022 model years, ending with the Type S. Both generations are rare, and key work calls for care: the early car uses a chip key, while the later car's smart key is best handled through an Acura dealer.
• RDX (2007–2026). The RDX is Acura's compact crossover, sold since the 2007 model year. The first generation used a turbocharged 2.3-liter four, the second switched to a 3.5-liter V6 for 2013, and the third, launched for 2019, returned to a turbocharged 2.0-liter four with available SH-AWD before a refresh for 2022. Key types track those changes: a flip key with an ID46 chip at first, push-button smart keys from 2013, and a newer fob family after the 2022 refresh.
• RL (2000–2012). The RL was Acura's flagship sedan through the 2012 model year. The first generation, sold here through 2004, used a 3.5-liter V6 and a conventional chip key with a separate remote. The second generation arrived for 2005 as the first Acura with SH-AWD, and it came standard with Keyless Access: the driver starts the car by turning a knob on the steering column while the fob stays in a pocket. The RLX replaced it for the 2014 model year.
• RLX (2014–2020). The RLX succeeded the RL as Acura's large sedan for the 2014 through 2020 model years. It was offered with front-wheel drive and Precision All-Wheel Steer, and as the Sport Hybrid SH-AWD, which paired a V6 with three electric motors. Every RLX uses push-button start with a smart key. Sales were modest, so RLX fobs are less common than TLX or MDX fobs, and we confirm the part number for your year before ordering anything.
• RSX (2002–2006). The RSX replaced the Integra as Acura's compact sport coupe for the 2002 through 2006 model years. Built in Japan on the same platform as the seventh-generation Civic, it came as the base RSX with a 2.0-liter four and as the Type-S with a higher-output version of that engine. Every RSX uses a chip key with a separate keyless entry remote, a setup that keeps spare keys and lost-key jobs straightforward. Cars through 2005 use a fixed-code Megamos 13 transponder, and the final 2006 model year may use a newer chip, so we test your key before cutting anything.
• TL (2000–2014). The TL was Acura's core midsize sedan from the 1999 model year through 2014, built in Marysville, Ohio. Three generations fall within our 2000 to 2014 coverage: the 3.2 TL and Type-S through 2003, the sharper 2004 to 2008 car, and the larger fourth generation of 2009 to 2014, which added SH-AWD. Each redesign brought a different key: chip keys with separate remotes, then a mid-cycle move to flip keys, then optional Keyless Access smart keys on the last generation.
• TLX (2015–2025). The TLX replaced both the TL and TSX for the 2015 model year and was built in Marysville, Ohio. The first generation ran through 2020 with four-cylinder and V6 engines, and the second, launched for 2021, added the turbocharged V6 Type S. Acura ended TLX production in July 2025, so 2025 is the final model year. Every TLX uses push-button start with a smart key, though the fob changed with the 2018 facelift and again with the 2021 redesign.
• TSX (2004–2014). The TSX was Acura's compact sport sedan for the 2004 through 2014 model years, a version of the Accord sold in Europe and Japan, built in Sayama, Japan. The first generation used a chip key with a separate remote, and the second moved to a flip key with the remote built in. A V6 joined the lineup for 2010 and a Sport Wagon for 2011. No TSX was offered with push-button start, so every replacement is a cut and programmed key.
• ZDX (2010–2024). Acura has used the ZDX name twice. The first ZDX, sold for the 2010 through 2013 model years, was a sloped-roof crossover with a V6 and SH-AWD, built in Ontario, Canada. The second was an electric crossover developed with General Motors on its Ultium platform, built at Spring Hill, Tennessee, and sold for the 2024 model year before production ended in 2025. The two share a name but nothing in their key systems.

Common Acura key problems

• Broken flip-key hinges on 2007-2013 MDX and RDX keys and 2009-2014 TL and TSX keys. The blade stops locking open or flops loose. A new shell can often reuse the original board and chip, but a cracked board means a new programmed key.
• Lost remotes on models with separate fobs. On the early TL, CL, RL, MDX, RSX and first-generation TSX, the chip lives in the key, so a missing remote only affects keyless entry and can be replaced on its own.
• Worn edge-cut keys on early-2000s Acuras. Two decades of use rounds off the cuts and makes the ignition sticky or hard to turn. A key cut to the factory code usually works better than a copy of the worn original.
• Weak smart key batteries. Most Acura smart fobs from 2009 on take a CR2032 coin cell. With a dying battery, holding the fob against the ENGINE START/STOP button usually lets the car read its chip and start anyway.
• Seized driver's door lock cylinders on smart key cars. The emergency blade almost never gets used, so the cylinder can corrode and refuse to turn the day the fob dies. Try your blade in the door lock every few months.
• Ordering the wrong fob online. Acura fobs that look identical can differ in frequency, transponder and memory position (Driver 1 or Driver 2). Match the FCC ID and part number on your current fob before buying, or let us source the part.
• Four-button spares on remote-start cars. Some 2014 and later Acuras shipped with a five-button fob that includes remote engine start. A four-button replacement will drive the car but won't start it remotely, so count your buttons before ordering.
• No-start after a key is dropped or run through the wash. A damaged chip can leave the key turning the ignition, or the fob locking doors, while the engine refuses to start. Testing the transponder tells us whether the key needs replacing.

Dealer or mobile locksmith?

Dealers have one clear advantage: direct access to the manufacturer's own systems. Some newer vehicles tie key programming to online authorization that only a dealer can use, and certain all-keys-lost situations on specific platforms still require it. A good locksmith knows where those lines are. Where we can do the job, we use professional programming equipment that talks to the same immobilizer and keyless systems through the OBD-II port, and in many cases the result is identical: a properly registered key that starts the car. Where we can't, we can often still help by opening the vehicle, cutting a mechanical blade from code, or helping you gather what the dealer will ask for so that visit goes smoothly. For your Acura car, ask us directly and you'll get a plain answer.

How the job works

1. Identify the exact key your car uses. We ask a few quick questions on the phone: the year, whether the car starts with a turn key or a button, how many keys you have left, and whether the remote still works the doors. Then we check the VIN against our programming references so the van arrives with the correct blank or fob, not a close guess.
2. Verify ownership before any work. Before cutting or programming, we compare your government photo ID with the vehicle registration or title and check that the VIN on the paperwork matches the VIN on the dash. If the registration is locked inside, we open the car first, confirm the documents, and only then make the key.
3. Get the key code or decode the lock. A key is cut from a code, not a guess. When the factory code can be retrieved through manufacturer channels after ownership is verified, we use it. When it can't, we decode a door lock with a pick-decoder tool that reads the wafer positions without damaging anything, then work out any missing cuts.
4. Cut the blade on-site. Our van carries a code-cutting machine that handles both traditional edge-cut blades and the laser-cut, side-milled profiles common on newer keys. The blade is cut to the code, then test-fitted in a door lock and the ignition or emergency keyhole to confirm smooth operation before any programming begins.
5. Program the chip, remote or smart key. Programming tells the car's computers that the new key belongs to the vehicle. Transponder chips are added to the immobilizer, remote buttons to the body control module, and proximity fobs to the keyless system. If a step requires dealer-only access on your car, you'll have heard that before we arrived, not halfway through the job.
6. Test everything and clear out old keys. The last step is a short walkthrough. We show you how many keys the car now recognizes, point out the dead-fob start method for your vehicle, and hand you an itemized receipt. If a spare makes sense, it's simplest to add it during this same visit while the equipment is already connected.

Proof of ownership

Not every situation fits the simple case, so here's how we handle the common exceptions. For a leased or financed vehicle, a registration that lists you as the registered owner or lessee works with your ID. If you just bought the car, bring the signed title or bill of sale along with your ID. For a company or fleet vehicle, we need written authorization from the business plus the driver's ID. If the car belongs to a family member, the registered owner should be present or provide signed permission and a copy of their ID. Rental vehicles go through the rental company.