Infiniti Key Replacement in Arcadia, CA

How Infiniti keys and immobilizers work

Nearly every Infiniti sold in the US since 2000 has an engine immobilizer built on Nissan's NATS (Nissan Anti-Theft System). A transponder in the key or fob has to answer the car's challenge before the engine is allowed to run, and the small security light on the dash blinks while the system is armed. The chip inside changed over the years. The 1997-2001 Q45 used a fixed-code Texas 4C transponder, while the G20, I30, I35 and QX4 used the Texas Crypto 4D60. From 2003 the G35, FX and later models moved to the Philips ID46, which stayed in the Intelligent Key fobs of many models well into the 2010s. Infiniti's Intelligent Key lets the car recognize a fob in your pocket; some early cars such as the FX paired it with a turning ignition knob, and push-button start became standard on most models by about 2009. From roughly 2013 the newer fobs use different electronics, and a replacement has to match both the FCC ID and the IC number printed on the original. The QX30 is the outlier: its key system came from Mercedes-Benz.

Infiniti key programming

Infiniti key programming runs through the OBD-II port under the dash. Most models from 2003 on need a security PIN, which professional programmers read or calculate from the body control module (BCM); older NATS cars use a comparable code from the immobilizer side. Two rules catch owners out. First, registering keys usually wipes every key that is not present, so bring all the keys and fobs you want to keep. Second, the replacement has to match the original's FCC ID and part number, and on newer fobs the IC number as well; a fob that looks identical but was built for another model will not register. Used smart keys from about 2013 on are locked to their first car and must be unlocked before reuse. On the newest platforms, including the 2022-on QX60 and 2025-on QX80, tool coverage varies by build, so we check the VIN before promising an all-keys-lost job.

All Infiniti keys lost

Losing every key to an Infiniti is often fixable on site without a tow, depending on the model. We verify ownership first, with your ID plus the registration or title, and then open the car without damage. The mechanical blade is cut by key code or decoded from a door lock; most Infinitis from 2000 into the 2020s use the same NSN14-style edge-cut profile (Ilco DA34), with a few older exceptions. On turn-key models that blade gets a transponder head and is programmed over OBD-II. On Intelligent Key models we register new fobs to the car and cut the emergency blade that hides inside each one. Several models are marked limited here because all-keys-lost can need extra procedures or a dealer PIN, and the QX30's Mercedes-based system is a dealer job. We tell you which case applies before any work starts.

Infiniti models we cover

• EX35 (2008–2012). The EX35 was Infiniti's compact luxury crossover, built on the same rear-drive platform as the G35 and G37 sedans with a 3.5-liter V6 and optional all-wheel drive. It was sold from 2008 through 2012, became the EX37 for 2013, and carried on as the QX50 from 2014. Every EX35 has an Intelligent Key with push-button start, using a compact three-button fob with an emergency blade tucked inside.
• EX37 (2013–2013). The EX37 was a one-year name: the 2013 EX compact crossover after Infiniti swapped in a 3.7-liter V6. The body, cabin and Intelligent Key system carried over from the EX35, and the same vehicle continued as the QX50 for 2014 through 2017. Push-button start is standard, and the three-button fob is shared across the EX family and the early QX50, which keeps replacement parts easy to source.
• FX35 (2003–2012). The FX35 was the V6 version of Infiniti's sporty FX crossover. The first generation (2003-2008) shared its platform with the G35 and offered an early Intelligent Key on some cars, while the second generation (2009-2012) added push-button start. For 2013 the V6 model became the FX37, and from 2014 the line was renamed QX70. Key work differs a lot between the two generations, and even within the first one, so the type of key you hold matters.
• FX37 (2013–2013). The FX37 was the 2013 version of the FX crossover's V6 model, after the 3.5-liter engine gave way to a 3.7-liter V6. It was sold for a single model year alongside the FX50 before the line was renamed QX70 for 2014. Its keys are the same push-button Intelligent Keys used across the 2009-2013 FX range, so parts are easy to match and a related FX50 or QX70 fob often works as a replacement.
• FX45 (2003–2008). The FX45 was the V8 version of the first-generation FX crossover, sold from 2003 through 2008 with a 4.5-liter engine and all-wheel drive. It shares its body, cabin and key hardware with the FX35 of those years, including the early Intelligent Key on equipped vehicles. The V8 FX became the FX50 for 2009, when the redesigned second generation arrived with push-button start.
• FX50 (2009–2013). The FX50 was the V8 model of the second-generation FX crossover, sold from 2009 through 2013 with a 5.0-liter V8 and all-wheel drive. Every FX50 has push-button start with an Intelligent Key shared with the FX35, FX37 and later QX70, so its fobs, emergency blades and programming steps match the V6 models of the same generation exactly. For 2014 the FX line was renamed QX70.
• G20 (2000–2002). The G20 was Infiniti's entry sport sedan, a compact four-door based on the Nissan Primera with a 2.0-liter four-cylinder engine and an available manual gearbox. The second-generation car returned for the 1999 model year and was sold through 2002, after which the rear-drive G35 took its place. For a locksmith it is a simple car: a chipped edge-cut key and a separate keyless-entry remote, with no smart key on any trim.
• G25 (2011–2012). The G25 was a short-lived entry version of the G sedan, sold for the 2011 and 2012 model years with a 2.5-liter V6 and rear-wheel or all-wheel drive. It shares the V36 body, cabin and Intelligent Key system with the G37 sedan, so its key needs are identical: a four-button smart fob with an emergency blade inside and push-button start on every trim.
• G35 (2003–2008). The G35 brought rear-wheel drive and a 3.5-liter V6 to Infiniti's entry line, sold as a sedan for 2003-2008 and a coupe for 2003-2007, with all-wheel-drive G35x sedans along the way. Its key story changes mid-run: most early cars use a chipped key and separate remote, some later V35 cars came with a keyless Intelligent Key, and the redesigned 2007-2008 sedan made push-button start standard.
• G37 (2008–2013). The G37 carried the G line from 2008 to 2013 as a coupe (from 2008), a sedan and a retractable hardtop convertible (both from 2009), all powered by a 3.7-liter V6. Every G37 uses Infiniti's Intelligent Key with push-button start, and the same four-button fob serves all three body styles. After 2013 the coupe and convertible were renamed Q60, and the sedan briefly returned under the Q40 name for 2015.
• I30 (2000–2001). The I30 was Infiniti's front-wheel-drive midsize sedan, built alongside the Nissan Maxima. The A33 version sold here for the 2000 and 2001 model years used a 3.0-liter V6 and was replaced by the I35 for 2002. Keys are simple by modern standards: a chipped edge-cut ignition key and a separate keyless-entry remote, with no smart key option on any trim, which keeps replacement work quick and predictable.
• I35 (2002–2004). The I35 replaced the I30 for 2002 and ran through the 2004 model year, keeping the front-drive, Maxima-based layout but moving up to a 3.5-liter V6 and a more upscale cabin. It uses a transponder ignition key and a separate four-button remote with trunk release, so replacement work is a cut-and-program job with no smart key involved. Its successor in spirit was the rear-drive G35 sedan.
• JX35 (2013–2013). The JX35 was Infiniti's first three-row crossover, built in Smyrna, Tennessee with a 3.5-liter V6 and a continuously variable transmission. It was sold only for the 2013 model year before being renamed QX60. The JX uses a newer-generation smart key than the rest of the 2013 Infiniti line, with push-button start and four- or five-button fobs, the five-button version adding remote start, all of which carried straight over to the early QX60.
• M35 (2006–2010). The M35 was the V6 model in Infiniti's Y50 midsize luxury sedan line, sold from 2006 through 2010 with a 3.5-liter engine and an all-wheel-drive M35x version. It sat alongside the V8 M45 and shares its Intelligent Key system, so fobs, emergency blades and programming steps are the same across both cars. For 2011 the redesigned Y51 sedan replaced it with the M37, while the M35h name moved to the hybrid.
• M35h (2012–2013). The M35h was the hybrid version of the Y51 M sedan, pairing a 3.5-liter V6 with an electric motor and a lithium-ion battery pack for the 2012 and 2013 model years. When Infiniti renamed its lineup for 2014 it continued as the Q70 Hybrid. Key-wise it matches the M37 and M56: an Intelligent Key with push-button start, plus a hybrid system that has to power up normally before the car will drive.
• M37 (2011–2013). The M37 was the volume model of the Y51 M sedan for 2011 through 2013, with a 3.7-liter V6 and an M37x all-wheel-drive option. For 2014 Infiniti renamed it the Q70 without major changes to the key system. Every M37 has an Intelligent Key with push-button start, and its four-button fob is shared with the M56, the M35h hybrid and the later Q70, which keeps parts widely available.
• M45 (2003–2010). The M45 badge covered two different sedans. The 2003-2004 Y34 car was a rear-drive V8 sedan based on the Japanese-market Nissan Gloria, while the 2006-2010 Y50 car shared its body with the M35 and added an all-wheel-drive M45x for 2008. There was no 2005 model. Keys differ sharply between them: the early car uses a chipped key and fob set, the later one an Intelligent Key with push-button start.
• M56 (2011–2013). The M56 was the V8 flagship of the Y51 M sedan, sold for 2011 through 2013 with a 5.6-liter engine and an M56x all-wheel-drive version. It became the Q70 5.6 when Infiniti renamed its lineup for 2014. The key system matches the M37 exactly: a four-button Intelligent Key with push-button start and an emergency blade inside the fob, so parts and programming are shared across the Y51 family.
• Q40 (2015–2015). The Q40 was a one-year model: the outgoing G37 sedan sold under a new name for 2015 as a value alternative to the Q50. It kept the 3.7-liter V6, rear- or all-wheel drive, and the G37's Intelligent Key with push-button start. If you know G37 keys, you know Q40 keys; the fob, emergency blade and programming method carry over unchanged, which makes parts easy to find.
• Q45 (2000–2006). The Q45 was Infiniti's V8 flagship sedan. The Y33 generation, sold through the 2001 model year, used a 4.1-liter V8, and the F50 generation that followed for 2002-2006 moved to a 4.5-liter V8 and a more tech-heavy cabin. Both are turn-key cars with chipped keys, but the parts differ: the Y33 reads a fixed-code chip, while the F50 uses a fob set that is now hard to find.
• Q50 (2014–2024). The Q50 launched for 2014 as the G37 sedan's replacement and ran through the 2024 model year, with V6, hybrid, 2.0-liter turbo and 3.0-liter twin-turbo engines over its life, including the 400-horsepower Red Sport 400. It moved Infiniti's sedans to a new generation of push-button smart keys with their own FCC IDs. Fob part numbers changed for 2016 and again around 2020, so matching your original matters when ordering a replacement.
• Q60 (2014–2022). Q60 has named two different coupes. For 2014 and 2015 it was the renamed G37 coupe and convertible with a 3.7-liter V6. After a gap year, the all-new 2017-2022 Q60 coupe arrived with 2.0-liter turbo and 3.0-liter twin-turbo engines, including the Red Sport 400. Both use push-button Intelligent Keys, but the fobs are completely different, so the model year decides which key you need.
• Q70 (2014–2019). The Q70 was the 2014 renaming of the Y51 M sedan, sold through the 2019 model year with a 3.7-liter V6, a 5.6-liter V8 and a hybrid, plus the long-wheelbase Q70L from 2015. Its Intelligent Key and push-button start carried over directly from the M37 and M56, which keeps parts and programming straightforward. Infiniti discontinued both the Q70 and the Q70L after the 2019 model year.
• QX4 (2000–2003). The QX4 was Infiniti's first SUV, a luxury version of the R50 Nissan Pathfinder built on a unibody platform. It was sold here through the 2003 model year, gaining a 3.5-liter V6 in place of the earlier 3.3-liter for 2001. Keys are straightforward: a chipped edge-cut ignition key and a separate keyless-entry remote, with parts and programming shared with the Pathfinder of the same years.
• QX30 (2017–2019). The QX30 was a subcompact luxury crossover sold for 2017 through 2019, built in Sunderland, England, on the Mercedes-Benz platform shared with the first-generation GLA. It used a 2.0-liter turbocharged four-cylinder with front- or all-wheel drive. Its key system is Mercedes-derived rather than Nissan-based, which makes it the hardest modern Infiniti to key and usually a dealer job for new fobs.
• QX50 (2014–2025). QX50 has named two crossovers. The 2014-2017 model was the renamed EX37, a rear-drive-based compact with a 3.7-liter V6, stretched in wheelbase for 2016. The 2019-2025 model is an all-new front-drive-based design with Infiniti's variable-compression 2.0-liter VC-Turbo engine. Their keys differ completely: the first uses older ID46-era fobs, the second newer KR5TXN1 fobs on a newer electrical architecture, which changes what a lost-key job involves.
• QX55 (2022–2025). The QX55 is the coupe-styled sibling of the second-generation QX50, sold for the 2022 through 2025 model years with the same 2.0-liter VC-Turbo engine and all-wheel drive. Built alongside the QX50 in Mexico, it was dropped with its sibling at the end of 2025. Its keys are the QX50's KR5TXN1 smart fobs with push-button start, so parts and procedures carry over between the two.
• QX56 (2004–2013). The QX56 was Infiniti's full-size, body-on-frame SUV with a 5.6-liter V8. The first generation (2004-2010) was based on the Nissan Armada and built in Canton, Mississippi; the second generation (2011-2013) moved to the global Nissan Patrol platform before being renamed QX80 for 2014. Keys run from a plain transponder key on early trucks to an Intelligent Key from the 2008 facelift, with a push-button Intelligent Key on the second generation.
• QX60 (2014–2026). The QX60 is Infiniti's three-row family crossover, built in Smyrna, Tennessee. The first generation (2014-2020) continued the 2013 JX35 with a 3.5-liter V6 and a 2014-2017 hybrid version; there was no 2021 model year. The redesigned 2022-on QX60 added a nine-speed automatic and newer electronics. Smart keys changed several times along the way, so part matching is important when you order a replacement.
• QX70 (2014–2017). The QX70 was the 2014 renaming of the second-generation FX crossover, sold through the 2017 model year with a 3.7-liter V6 and rear- or all-wheel drive; the FX50's 5.0-liter V8 lasted only through 2014. It kept the FX's Intelligent Key and push-button start, so FX37 and FX50 fobs with matching part numbers serve as replacements, and the programming procedure is unchanged from the FX.
• QX80 (2014–2026). The QX80 is Infiniti's full-size SUV. The 2014-2024 model continued the Z62 QX56 with a 5.6-liter V8 and Patrol-based body-on-frame construction. The third-generation QX80 arrived for 2025 with a twin-turbo 3.5-liter V6, a new interior and newer electronics. The key system changed with it, moving from an ID46 Intelligent Key to a new fob family, and lost-key work on the new truck is more involved.

Common Infiniti key problems

• Weak fob batteries are the most common cause of a key-not-detected warning on push-button Infinitis. Most fobs take a CR2032 or CR2025 coin cell, and a fresh battery often clears the warning without any reprogramming.
• Some late-2000s push-button Infinitis can show a steering-lock fault that looks like a key problem: the car refuses to start and the dash flags the steering lock. That points to a column-module repair, not a new fob.
• Programming wipes keys that are not present. Owners who add a spare without bringing every other key often find an old fob suddenly stops starting the car, so gather every key before the appointment.
• Secondhand fobs bought online often fail. Newer smart keys lock to their first vehicle and must be unlocked, and a fob with the wrong FCC ID, IC number or part number will not register no matter how similar it looks.
• On older turn-key models like the I35, G35 and QX4, worn keys and ignition wafers cause sticking or no-turn ignitions. Cutting a fresh key by code, rather than copying a worn one, often solves it.
• Intelligent Key shells crack and emergency-key releases break with age. A replacement shell can reuse the original circuit board, so the fob usually stays registered to the car and does not need a full new key.
• A flashing security light with a key that looks fine usually points to a cracked transponder, a fob with a damaged chip, or an aftermarket remote-start bypass module interfering with the immobilizer.
• A dead 12-volt battery can leave you outside a push-button Infiniti even with a good fob. The mechanical key hidden inside the fob opens the driver's door so you can reach the hood release.

Dealer or mobile locksmith?

Price and parts are the other half of the comparison. Dealers typically sell factory keys only and charge their posted service rates for programming. We offer factory keys where it matters and quality aftermarket alternatives where they perform well, and the quote covers cutting, programming and the trip, with nothing tacked on at the end. Timing differs too. Dealer service departments generally keep business hours, while we take automotive calls every day from 6:30 a.m. to 11:30 p.m., which covers early commutes and late evenings. We're closed overnight, and we'll be upfront if your timing means the dealer or a next-day visit is the better plan. Neither option is wrong; the right one depends on your car and your schedule.

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. Before we leave, every function gets checked: doors, trunk or liftgate, panic button, remote range, engine start, and the emergency blade in the driver's door. If keys are missing, we delete them from the car's memory where the system allows, so a lost key can no longer start the engine.

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.

Infiniti keys in Arcadia

Arcadia is about 46 miles from our San Bernardino base, roughly 50 minutes in light traffic via Palm Avenue to I-215 North, I-15 South to the SR-210/I-210 Foothill Freeway. When you call, you get an arrival estimate based on where the technician is and the traffic at that moment. Stuck on the shoulder or in a parking lot along I-210? Get somewhere safe, turn on your hazards, and give us the nearest exit or business so we can find the car without guessing.

Planning a non-urgent job like a rekey, a smart lock install or a safe combination change? Every day of the week, appointments are available from first thing in the morning into the late evening, with 11:30 p.m. as closing time. Fridays and Saturdays follow the same schedule.