TextFX35 Key Security, Generation by Generation
S50 First Generation
A traditional transponder key with an ID46 chip and a high security blade. You insert this one into the ignition like a normal key, no push-button start. The NATS immobilizer checks the chip every time you turn the key, and we can program it on-board without needing external servers.
S51 Second Gen Early
An Intelligent Key smart fob with an ID46 chip, CR2032 battery, and push-button start. Infiniti moved to a proximity system here, so the key stays in your pocket while you walk up and press the button. Programming requires OBD-II diagnostic access and a PIN code, which we pull before we arrive.
S51 Second Gen Late
This is where security got serious. Infiniti switched to a Texas 4D transponder chip and added server authentication on top of OBD-II programming. That means the vehicle's ECM may need to verify the new key through Nissan's servers. We carry the tools to handle that, including Xhorse VVDI2 for server calculations.
What Key Does Your FX35 Actually Use?
A physical key you insert into the ignition. It has a hidden ID46 chip inside that talks to your NATS immobilizer every time you start the car.
A proximity fob that stays in your pocket. Your FX35 detects it when you grab the door handle and lets you start with the push button. There is a hidden emergency blade inside for dead battery situations.
Looks identical to the 2009-2010 smart key, but uses a Texas 4D chip with server authentication. Same push-button start, same emergency blade, but the programming process is more involved on our end.
Infiniti FX35 Key Pricing in San Diego County
Quoted on-site at your location: blank, blade cut, transponder or remote programming, full functional test before we close the van.
Mobile vs. Dealership
The Infiniti service bay at Kearny Mesa wants the FX35 on a flatbed before they will quote you. We quote on the phone and meet you wherever the vehicle is sitting, El Cajon, Oceanside, the Coronado island lots.
Skip the Dealer - Call Now: (619) 876-1271Problems We See on the Infiniti FX35
NATS Immobilizer Failure
Most common FX35 ticket Marco runs in San Diego: NATS lost sync with the ID46 chip after a weak 12V or jump spiked the BCM. Autel IM608 to OBD-II, read PIN, re-register, and you start it yourself.
Smart Key Fob Battery Drain
The CR2032 battery in 2009-2012 Intelligent Key drains faster than you would expect. Infiniti's proximity system constantly pings the fob, and if you store it near electronics or metal objects, the battery life drops even more. We check battery voltage before diagnosing anything else, a weak battery mimics more expensive problems. A fresh CR2032 costs a couple bucks and fixes the issue half the time.
High Security Blade Wear
Before we recommend a new key, we inspect the blade. Your FX35 uses a high security sidewinder blade that wears down with daily use, on the 2003-2008 models where you insert it into the ignition every time. A worn blade sticks, jams, or snaps off inside the cylinder. We cut replacements on a Silca Futura machine for a precise fit; we can decode existing locks on-site if the original blade is too worn to copy.
Programming Lockout
On 2011-2012 FX35s, wrong programming sequences or aftermarket tools lock the ECM and block new key registration. Marco runs Xhorse VVDI2 with server calculation to reset. Locked out in El Cajon or Escondido? Call (619) 876-1271.
Can You Program a FX35 Key on Your Own?
You can program the remote lock and unlock buttons yourself using an ignition cycle procedure. Insert and remove the key six times in ten seconds, wait for the hazards to flash, then press the lock button on your fob. But this only programs the remote functions. The ID46 transponder chip that actually lets the car start requires professional tools like Nissan Consult. Skip that step and your key locks the doors but will not turn the engine over.
No DIY option here. The 2009-2010 Intelligent Key system requires OBD-II diagnostic equipment and a PIN code for programming. You need a professional locksmith or dealer for both the proximity function and the transponder.
Same story as the 2009-2010, but with an added layer. The Texas 4D chip may require server authentication, which means even some locksmiths cannot handle it without the right tools. We carry Xhorse VVDI2 specifically for these server calculations.
How It Works
Reach Out
Call or text (619) 876-1271 with your exact Infiniti FX35 year and how many working keys you still have.
We Roll to You
Anywhere across San Diego County, from Oceanside down to Imperial Beach, we drive to where the Infiniti FX35 is parked.
Cut, Program, Verified
We cut the high security blade on-site, program the transponder to your NATS immobilizer, and test every function: start, lock, unlock, panic.
Related Services
One More Thing
Most San Diego FX35 owners do not realize Infiniti shipped this thing in 2003 with a NATS immobilizer that was rare on luxury SUVs at the time. The S50 chassis underneath is shared with the G35 sedan, which is why the key blade profile and the chip family line up between the two cars. If you have both an FX35 and a G35 in the driveway, Marco can knock out spares for both on the same visit.
KEY REPLACEMENT ACROSS ALL OF SAN DIEGO COUNTY
We come to you, anywhere in San Diego County. No shop visit, no towing. Our mobile locksmith arrives at your home, office, or roadside.
Infiniti Key Work Live
Watch an Infiniti proximity fob get cut and synced on location.
Infiniti Key Replacement Call Now
QX60, Q50, QX80. Infiniti key service across all of San Diego County.
