The Infiniti FX is one of the trickier vehicles we get called about in Statesboro, and the reason is right there in the name. The same crossover wears two identities: it sold as the FX35 in its earlier years and was renamed the QX70 later in life. Owners who bought used often do not realize the badge change covers the same platform, which makes ordering the right key confusing if you go by name instead of year. Sorting that out is the first step every time.
We are a mobile automotive locksmith and come to the vehicle wherever it sits, whether near Northside Drive, close to East Georgia Regional Medical Center, or off Hwy 80. This guide explains what the FX35 and QX70 use across their two key eras, how a lost-key visit runs, the ignition story on the early cars, and how to tell a tired fob battery from a real programming fault.
Infiniti FX35 / QX70 Key Types by Model Year
The FX35 and QX70 carry two key setups across their run, and the right blade, chip, or fob depends entirely on the year, not the badge. Whether the car has a start button or a key you physically turn is the quickest tell, and we confirm the exact part by VIN before we head out so the correct part comes with us.
NSN14 blade, PCF7936 ID46 chip.
Push-to-start option (FCC: 285E3-4BU0C or KR55WK48903).
How FX35 / QX70 Key Systems Changed Over the Years
The 2003-2008 FX35 uses a mechanical NSN14 blade with a PCF7936 ID46 transponder chip, a true turn-key crossover that reads the chip before it will start. This is the era where the FX35 badge lives, and a key for one of these cars is cut and chipped rather than a proximity fob.
From 2009-2017 the car (later badged QX70) runs proximity push-to-start on either the 285E3-4BU0C or the KR55WK48903. Because the same vehicle was renamed mid-life, the smart move is to search by model year and the FCC ID printed on the original fob rather than by the name on the tailgate, so the right 285E3-4BU0C or KR55WK48903 ends up in your hand.
FX35 / QX70 Fob: Battery Problem or Programming Problem?
Before assuming a fob has failed, rule out the battery. The proximity fobs run on a CR2032 coin cell, and a weak one is the most common reason a remote stops locking from a distance or forces you to hold it against the start button. A fresh cell often brings it fully back to life.
A true programming fault is different. If a new battery does not help, if a security light stays lit, or if the car will not recognize the key at all, the problem is on the immobilizer side and the key needs re-pairing. This is also where the two possible fobs matter, since a 285E3-4BU0C and a KR55WK48903 are not freely interchangeable across the run.
Push-to-Start and Proximity Keys on the FX35 / QX70
From the 2009 model year the FX, by then becoming the QX70, uses proximity push-to-start. As long as the fob is in your pocket or bag the doors respond on touch and the car starts with a button. When the system stops recognizing it, suspect a weak coin cell first and a pairing fault second. Adding or replacing a proximity fob is a programming job, not just a cut key, and we verify lock, unlock, and push-button start before we leave.
Lost All Keys to Your FX35 / QX70?
Losing every working key to an FX35 or QX70 is a bigger job than copying a spare, but one we handle at the car. With no key to seed the programming, the tool reads the immobilizer data from the vehicle before it can enroll a new key, which on the proximity years means working through the security system rather than cloning an existing fob.
For the 2003-2008 FX35 we cut a new NSN14 blade and program the PCF7936 ID46 chip from your VIN; for the 2009-2017 cars we build and pair the matching proximity fob. It does not require a dealer tow for the large majority of these years, and we confirm the engine starts before we finish.
Why a Spare FX35 / QX70 Key Is Worth It
If you still have one working key, a planned spare made before trouble strikes is the smart play. With a working key on hand to seed the programming, adding a second is a short job, and a luxury crossover on a single fob is one drop away from a much larger problem. We cut and program spares at the vehicle, so a dealer visit never enters your schedule.
FX35 / QX70 Ignition and Door Lock Issues
On the early 2003-2008 FX35 the call is sometimes about the ignition rather than the key. The NSN14 bladed cars wear their cylinders over years of daily use, and the symptom is a key that sticks, has to be wiggled, or will not turn even though it is the correct key. That is a mechanical repair rather than a programming one, so we diagnose it at the car and tell you whether a fresh key cut to code or cylinder service is the right path.
What to Have Ready for Your FX35 / QX70
- The year of your FX35 or QX70, which matters more than the badge for the right part.
- The VIN, usually visible through the lower corner of the windshield, so we confirm the exact part.
- How many working keys you have, since a spare is a different job than a lost-all-keys visit.
- Whether the car has a start button (proximity) or a key you physically turn (bladed transponder).
- The FCC ID printed on the original fob if you have one, since two proximity fobs were used.
- A photo ID and the registration or title, so we can verify the vehicle is yours before programming.
Dealer vs Mobile Locksmith for the FX35 / QX70
An Infiniti dealer can make a key for these cars, but for most years it means transport to the dealership, an appointment, and leaving the vehicle on their schedule. As a mobile locksmith we bring the blanks, chips, and programmer to you and work in your driveway or a parking lot. The rare case that truly needs manufacturer coordination is something we flag when we confirm your VIN, not after we arrive.
FX35 / QX70 Key Service Around Statesboro
We serve FX35 and QX70 drivers across Statesboro and all of Bulloch County, coming to homes, workplaces, and parking lots instead of asking you to come to us. Whether the car is parked near East Georgia Regional Medical Center, off Hwy 80, or along Northside Drive, we bring the service to the vehicle and aim to arrive with the right parts for your year on the first trip.
Example FX35 / QX70 Situations We See
Example. A driver parking near East Georgia Regional Medical Center drops the only fob to a 2012 QX70 and cracks it on the parking-deck concrete. We confirm the FCC ID on the broken fob, build the matching 285E3-4BU0C or KR55WK48903 at the car, and verify the doors and start button respond.
Example. Someone buys a used 2007 FX35 off Hwy 80 with a single NSN14 key and wants a backup. We cut a fresh blade, program the PCF7936 ID46 chip on-site, and they leave with a real spare instead of relying on one key.
Example. An owner is shopping for a key by the QX70 name and keeps getting the wrong part. We explain the car was the FX35 earlier in life, pull the correct fob by year and FCC ID, and pair it at the vehicle.
Related Key Services
- all Infiniti car keys and models
- automotive locksmith service
- car key and fob programming
- transponder key service
- ignition repair and replacement
- emergency car lockout help
- how transponder chips work
Other compact luxury SUVs we service
Cross-shopping the Infiniti FX35 / QX70 against other compact luxury SUVs? We make and program keys for these comparable models too:
- Infiniti FX35 / QX70 vs Lexus NX key replacement
- Infiniti FX35 / QX70 vs Lincoln Corsair key replacement
- Infiniti FX35 / QX70 vs Mercedes-Benz GLA key replacement
- Infiniti FX35 / QX70 vs Mercedes-Benz GLB key replacement
Infiniti FX35 / QX70 Key Questions, Answered
Is the QX70 the same car as the FX35?
Yes. The same crossover sold as the FX35 in its earlier years and was renamed the QX70 later in life. Because of that, we search by model year and the FCC ID on the original fob rather than the badge, so you end up with the correct part.
Can you make an FX35 or QX70 key without the original?
Yes. For the large majority of these years we make a key with none in hand by reading the immobilizer data and building the key from your VIN, then enrolling it against the car. It takes more steps than copying a spare but does not require a dealer trip for most years.
Which proximity fob does my QX70 use?
The 2009-2017 cars use either the 285E3-4BU0C or the KR55WK48903. They are not freely interchangeable, so we read the FCC ID off your original fob or confirm by VIN before sourcing the part.
My fob stopped working. Is it broken?
Often not. These proximity fobs use a CR2032 coin cell, and a weak battery is the most common reason a remote stops responding at a distance or makes you hold it to the start button. If a fresh cell does not help and the car still will not recognize the key, the fob likely needs re-pairing.
Why is my early FX35 key getting hard to turn?
On higher-mileage 2003-2008 FX35s that is usually a worn ignition cylinder rather than a bad NSN14 key. Years of daily use wear the lock, so the key sticks or will not turn even though it is correct. We diagnose this at the car and tell you whether a fresh key or ignition service is the fix.
Do you come to me in the Statesboro area?
Yes. We are a mobile locksmith and come to your home, workplace, or wherever the FX35 or QX70 is parked across Statesboro and Bulloch County. Call (912) 209-6131 and we will confirm your year and VIN before heading out so we arrive with the right parts.