2007 Infiniti FX35 Key Replacement

2007 FX35 key specs

First-generation FX35s come two ways. Many use a chipped transponder key (NI04T style) with a separate keyless-entry remote, such as KBRASTU15 or CWTWB1U751. Others have Infiniti's Intelligent Key: a 2003-2004 three-button fob (FCC ID NHVWBU612) or a 2005-2008 fob (FCC ID CWTWBU619), used with a start control instead of a keyed ignition. Supplier listings show a different emergency blade (DA16, part H0564-CG005) for the 2003-2004 fob. A look at your ignition, cylinder or knob tells us which parts to bring.

What's specific to the 2007 FX35

The 2007 Infiniti FX35 is the fifth of 6 model years in the FX35 S50 (1st generation) (2003–2008), so it shares its key system with the rest of that run, which makes replacement parts easy to source. A 2007 Infiniti FX35 is about 19 years old. Original keys are often worn smooth, and some factory remotes for cars this age are discontinued, so we may suggest a quality aftermarket remote or a separate fob. Because older immobilizers are simpler, all-keys-lost jobs on cars this age are usually more straightforward than on late models.

Smart-key cars like the 2007 FX35 can be targeted with relay attacks that extend the fob's signal from inside your home, so keep fobs away from exterior walls or in a signal-blocking pouch, and have any missing fob erased from the car.

Key options for the 2007 Infiniti FX35

• Transponder (chip) key. There are two ways to give a new transponder key the right identity. Cloning reads the chip in a working key and writes that same ID onto a special cloneable chip, so the car can't tell the two apart. Programming adds a brand-new key ID to the immobilizer's memory through the OBD-II port, sometimes after entering a security PIN tied to the VIN. Cloning is handy when you have a working key and the chip family supports it. Programming is the better choice when keys are lost, because it also lets us remove keys you no longer control from the car's memory. For your Infiniti FX35, we'll explain which method fits and why.
• Key with separate remote fob. Some Infiniti FX35 owners carry two pieces: a transponder key for the ignition and a separate remote fob on the same ring. Because they work independently, you only have to replace what's actually missing or broken. A lost remote still leaves you with a key that opens the doors and starts the engine, so it's an inconvenience rather than an emergency. A lost key is the more urgent half, since it has to be cut and its chip programmed before the car will run. We stock and program both sides, and if the whole ring is gone, we handle the key first and then pair a new remote.
• Smart proximity key (push-to-start). Proximity keys bring a security trade-off worth understanding. Because the fob is always listening, thieves with relay equipment can stretch its signal from inside your house to the car in the driveway. Keeping the fob away from exterior walls, or in a signal-blocking pouch, closes that gap, and some fobs offer a sleep mode described in the owner's manual. If a smart key for your 2007 Infiniti FX35 is lost or stolen, programming a replacement is the moment to delete the missing fob from the car's memory. And be wary of used fobs from online sellers: a lot of them are locked to the vehicle they came from and can't be reprogrammed to yours.

How the Infiniti immobilizer works on the FX35

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.

• The S50 FX reads a Philips ID46 transponder, the same family used in the G35 of those years.
• The S51 generation was the first FX with push-button start.
• The 2005-2008 Intelligent Key fob (CWTWBU619) takes a CR2025 battery, while the 2003-2004 fob (NHVWBU612) takes a CR2032.

Programming a 2007 FX35 key

Transponder keys and Intelligent Keys are both registered to the S50's immobilizer over OBD-II using the NATS PIN, and the session rewrites the key list, so bring every key you still use. Separate remotes are programmed in their own step. All-keys-lost is handled on site: we cut a key or emergency blade by code and register new keys or fobs before we leave.

Conventional transponder-key cars are routine. Intelligent Key cars of this era can need extra steps for all-keys-lost, so we confirm key type and procedure by VIN before quoting.

Lost every key to your FX35?

1. Gather your documents and the VIN. Find your registration or title and a government photo ID in the same name. Note the VIN, which is printed on the driver's side of the dashboard and usually on your insurance card. If the paperwork is locked in the car, tell us; we'll open the vehicle first and check it there.
2. Get into the vehicle without damage. If the car is locked, we open it with non-destructive tools such as an inflatable wedge and a long-reach rod, or by picking the door lock. Some vehicles need a careful approach to avoid triggering the alarm, which can interfere with programming later.
3. Originate a new key from the car. With no key to copy, the cuts come from the vehicle itself. We retrieve the key code through manufacturer channels where possible, or decode a door lock with a pick-decoder tool. Then we cut the blade on our code machine and confirm it turns the lock smoothly.
4. Program the key to the immobilizer. Next, the new key is introduced to the car's security system. Many vehicles allow this through the OBD-II port with a PIN or security procedure. Some all-keys-lost cases require reading a module on the bench, and a few platforms only allow dealer programming, which we'll tell you up front.
5. Erase missing keys and add a spare. Once the car starts, we remove the lost keys from memory wherever the system allows, so they can't start the engine if someone finds them. Making a second key during the same visit costs much less than a repeat all-keys-lost call down the road.

Why a spare key pays for itself

• When you sell or trade in the vehicle, buyers and dealers expect two keys. A missing key can come up during an appraisal or a private-sale negotiation, so having both on hand keeps the conversation about the car, not about what it will cost the next owner to replace one.
• Two drivers sharing one key is a daily negotiation. A second key lets a partner, teenager or coworker use the vehicle without handing keys back and forth in parking lots, and it means one person losing their key ring doesn't leave the whole household stuck.
• Electronics fail without warning. A fob dropped on concrete, run through the washing machine or soaked at the pool can quit for good. With a second programmed key, that's an annoyance you fix on your own schedule, not a stranded car that needs attention today.

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 FX35 and your schedule.

FX35 key battery

Most fobs for a 2007 Infiniti FX35 open along a small slot in the seam; a coin or a plastic pry tool works better than a screwdriver, which chews up the housing. If the fob hides a mechanical blade, slide it out first, since the case often opens from that gap. Note which side of the old cell faces up, swap in a fresh replacement, and press the halves together until they click all the way around. Handle the new battery by its edges, because skin oil on the faces can hurt contact. In most cases the fob keeps its programming through a battery change, so test lock, unlock and start, and you're done.

How the job works

1. Identify the exact key your FX35 uses. Every job starts with the VIN, the trim and a look at any key you still have. From those we confirm the keyway, the transponder or smart-key chip, the remote frequency, the FCC ID and the button layout. Two Infiniti FX35 keys that look identical can carry different electronics, so this step keeps the wrong part from ever reaching the car.
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 FX35, 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.

What affects the price of an FX35 key

• Factory or aftermarket parts. Factory keys and fobs carry the manufacturer's part number and usually the highest parts cost. Quality aftermarket keys use compatible electronics at a lower price and work well on many vehicles. We tell you which options we trust for your car, and where an aftermarket version has known range or fit issues, we steer you to OEM.
• Programming complexity and security access. Some immobilizers accept a new key with a few on-board steps. Others need a PIN code, a timed security wait, manufacturer online access, or removing a module to read its data. Every extra layer of security on the Infiniti system adds equipment time and labor to the job.
• Blade style and cutting. The blade still matters on keyless cars, because the emergency insert has to fit the door lock. Cutting by code is standard for us. Decoding a door lock when no key or code exists adds time, and so does progressing any cuts the door lock doesn't show.
• Travel, timing and extra repairs. Because we come to you, the distance from our San Bernardino base and the time of the call play a part. So does anything we find along the way, such as a worn ignition cylinder or a seized door lock. You hear about each item and get a quote before we start work.

Call (951) 903-3193 with your VIN and the keys you still have, and we'll quote the job before any work starts.

Common Infiniti key problems

• 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.
• 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.

Tips from a mobile locksmith

• Photograph the back of your fob and any key tag that came with the car. The FCC ID, part number and key code printed there make ordering a replacement faster and more accurate. Store the photos somewhere you can reach from any device, not only on the phone that might go missing along with the keys.
• When a key's head cracks or its blade bends, replace it before it fails. A transponder chip can slip out of a split head, and a bent blade can break off inside the ignition or door lock, turning a simple key replacement into an extraction and repair job. Small symptoms are the inexpensive time to act.
• Southern California heat is hard on keys. Fob batteries drain faster, plastic housings turn brittle, and rubber button pads crack when a key spends summer afternoons on a dashboard or in a sunny cup holder. Carry the fob with you or keep it shaded, and replace batteries before summer rather than after they fail.

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.

Need a 2007 Infiniti FX35 key?

Locked out, keyless, or just tired of a fob that only works half the time? Julian's Locksmith can help with your FX35 in Southern California. Have your registration and photo ID ready, call (951) 903-3193, and we'll give you an honest answer about what we can do on-site and what it will cost before we head your way.