The Infiniti Q50 is a sport sedan we see around Statesboro after dark and on the weekend roads, and almost every one of them runs proximity push-to-start. That keeps the key situation simpler than the older bladed Infinitis, but it adds a different wrinkle: the Q50 used one proximity fob early in its run and a revised one later, and the two are not freely interchangeable. The first job is always confirming which fob your build year actually accepts.
We are a mobile automotive locksmith and bring the programmer to the car, whether it is parked downtown after a night out, in a driveway off Fair Road, or in a lot near Georgia Southern. This guide covers how the Q50's proximity system works across its generations, how a lost-all-keys visit runs, why a planned spare matters on a single-key car, and how to separate a tired fob battery from a real programming fault.
Which Q50 Key Do You Have?
The Q50 has been a proximity push-to-start car its whole life, so there is no bladed transponder era to sort through. What does change is the fob itself across the generations, and we confirm the exact part by VIN before we head out so the right fob and programmer come along.
Push-to-start standard. FCC: KR5S180144014 or KR5TXN4.
When Every Q50 Key Is Gone
Losing every working key to a Q50 is a bigger job than copying a spare, but one we handle at the car. With no fob left to seed the programming, the tool has to read the immobilizer data from the vehicle before it can enroll a new proximity key, which means working through the car's security system rather than cloning an existing fob.
Once we confirm whether your year uses the KR5S180144014 or the KR5TXN4, we build and pair the correct fob from your VIN and verify the engine starts before we wrap up. It takes more steps than a spare but does not require a dealer tow for the large majority of Q50 years.
Make a Spare Q50 Key Before You Need One
If you still have one working fob, a planned spare made ahead of trouble is the smart move. The Q50 tends to come in as a single-fob car, often a used buy that never had a backup, and that leaves it one dropped key away from a much larger problem. With a working fob on hand to seed the programming, adding a second is a short job, and we cut and program spares at the vehicle so a dealer appointment never enters the picture.
Model-Year and Generation Differences
The Q50 has used proximity push-to-start since 2014. Early cars run the KR5S180144014 fob, while later cars moved to the updated KR5TXN4. Both are smart keys that let you start the car with a button as long as the fob is on you, but they are tied to different build years and the wrong one will not pair.
Because the two fobs look similar but answer to different years, the build year decides which fob and which programming tool are required. We confirm that by VIN or by reading the FCC ID off your original fob, so the part we bring is the one your Q50 will actually accept rather than a near-match that refuses to enroll.
Ignition, Cylinder, and Lock Problems
Because the Q50 is push-to-start rather than a turn-key car, there is no traditional ignition cylinder to wear out the way an older bladed sedan would. The closest equivalent is the start-stop button and the fob's link to the car, so when starting gets unreliable the cause is almost always a weak fob battery or a pairing fault rather than a mechanical lock problem. We diagnose that at the car and re-pair the fob if needed.
Is It the Battery or the Programming?
Before assuming a fob has failed, rule out the battery. Q50 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 to crank. A fresh cell often brings it fully back.
A real 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 fob at all, the issue is on the immobilizer side and the key needs re-pairing. This is also where the wrong-generation fob shows up, since a KR5S180144014 will not stand in for a KR5TXN4 even though they resemble each other.
Q50 Smart Key and Push-Button Start
The Q50 has had proximity push-to-start from the start of its run. 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 rather than a simple cut key, and we verify lock, unlock, and push-button start before we leave.
Local Q50 Help in Statesboro and Beyond
We serve Q50 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 along Veterans Memorial Parkway, downtown after dark, off Fair Road, or near Georgia Southern, we bring the service to the vehicle and aim to arrive with the right fob for your year on the first trip.
Realistic Q50 Key Scenarios
Example. A driver cruising Veterans Memorial Parkway comes out to a Q50 that will not start, the fob unresponsive. A weak CR2032 turns out to be the cause, the fob wakes up with a fresh cell, and we confirm push-button start before they head out.
Example. Someone with a single-fob Q50 bought used near Georgia Southern asks for a backup. We confirm the build year, program a matching KR5S180144014 or KR5TXN4 as a true spare, and they no longer ride on one key.
Example. A driver drops the only fob to a later Q50 downtown and cracks it on pavement. We read the FCC ID, build the correct KR5TXN4 at the car, and verify the doors and start button respond before they leave.
Before You Call: Q50 Checklist
- The year of your Q50, which decides whether it uses the early or later proximity fob.
- The VIN, usually visible through the lower corner of the windshield, so we confirm the exact part.
- How many working fobs you have, since a spare is a different job than a lost-all-keys visit.
- 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.
- Whether the trouble is the fob buttons, the start button, or recognition, so we bring the right tools.
Q50 Keys: Dealership or Locksmith?
An Infiniti dealer can make a Q50 fob, but it usually means arranging transport to the dealership, waiting on an appointment, and leaving the sedan on their schedule. As a mobile locksmith we bring the fobs and programmer to you and do the work in your driveway or a parking lot. The rare case that genuinely needs manufacturer coordination is something we flag when we confirm your VIN, not after we arrive.
More Key and Lock Services
- all Infiniti car keys and models
- ignition repair and replacement
- emergency car lockout help
- how transponder chips work
- how proximity keys work
- smart key guide
- push-to-start key guide
Other compact luxury sedans we service
Cross-shopping the Infiniti Q50 against other compact luxury sedans? We make and program keys for these comparable models too:
- Infiniti Q50 vs Lexus IS 350 / IS 250 key replacement
- Infiniti Q50 vs Lincoln MKZ / Zephyr key replacement
- Infiniti Q50 vs Mercedes-Benz C-Class key replacement
- Infiniti Q50 vs Volvo S60 key replacement
Frequently Asked: Q50 Keys
Can you make an Infiniti Q50 key without the original?
Yes. For the large majority of Q50 years we make a fob 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 Q50 use?
Early Q50s use the KR5S180144014 while later ones use the KR5TXN4. They are not interchangeable, so we confirm by your build year or the FCC ID on the original fob before sourcing the part.
My Q50 fob stopped working. Is it broken?
Often not. Q50 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 fob, it likely needs re-pairing.
Does the Q50 have a regular ignition key?
No. The Q50 is proximity push-to-start across its run, so there is no turn-key cylinder. Starting problems usually trace back to a weak fob battery or a pairing fault rather than a worn lock, which we diagnose at the car.
Why should I get a spare for my Q50 now?
Many Q50s come in as single-fob cars, and once that one fob is lost the job becomes a full lost-all-keys visit. With a working fob on hand we can program a spare in a short visit, so you are not riding on one key.
Do you come to me in the Statesboro area?
Yes. We are a mobile locksmith and come to your home, workplace, or wherever the Q50 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 fob.