The Nissan Maxima is a sporty four-door we see a lot of around Statesboro, and over its recent generations the key behind it has changed in ways that catch owners off guard. A blade you turn, a proximity fob you carry, and two nearly identical later fobs that are easy to mix up all live under the same nameplate. Because the parts and programming do not cross over, the first real step in getting a working key is figuring out exactly which Maxima you are holding.
We are a mobile automotive locksmith and bring the work to the car, whether it is sitting in a driveway off Brampton Avenue, a space at Statesboro Crossing, or a lot near East Main Street downtown.
Which Maxima Key Do You Have?
The Maxima has moved through three key systems, and the right blade, chip, or fob depends entirely on your model year. If you are not sure which you have, the shape of the key and whether the car has a start button are the quickest tells, and we can confirm the exact part by VIN before we head out.
NSN14 blade, PCF7936 transponder.
Push-to-start option. Proximity fob (FCC: 285E3-4BU0C).
Standard push-to-start. FCC: KR5S180144014 or KR5TXN4.
When Every Maxima Key Is Gone
Losing every working key to a Maxima is a different job from copying a spare, but one we handle on-site. With no key to act as an authentication seed, the programmer reads the immobilizer data from the car before it can enroll a new key, which on the push-to-start years means working through the car's security system rather than cloning an existing fob.
On the early 2004-2008 cars we cut a fresh NSN14 blade and program the transponder; on the later proximity years we pair a new fob once we have confirmed whether the car wants the KR5S180144014 or KR5TXN4, then enroll the key and confirm the engine starts before we call it done.
Make a Spare Maxima Key Before You Need One
If you still have one working key, the smartest move is a planned spare made before you ever need it. With a working key on hand to act as the authentication seed, programming a second is a short job, and a Maxima running on a single fob for years is one lost key away from a much bigger problem, and we make and program spares on-site.
Model-Year and Generation Differences
The 2004-2008 Maxima is a turn-key car: it uses an NSN14 blade with a PCF7936 transponder in the head, so the chip has to be programmed to the car for the engine to start, not just cut to match the lock. The 2009-2015 generation added a push-to-start option built around a proximity fob carrying the 285E3-4BU0C number.
From 2016-2023 the Maxima standardized push-to-start, and here is where the confusion starts: those cars shipped with either the KR5S180144014 or the KR5TXN4 fob. The two are not interchangeable, so we verify the exact fob number on your car before ordering or programming. Matching the part to your specific year and fob is the single most important step on this model.
Ignition, Cylinder, and Lock Problems
On higher-mileage 2004-2008 Maximas the call is often less about the key and more about the ignition. 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 at all even though it is the correct key. A worn cylinder is a mechanical repair rather than a programming one, so we diagnose it on-site; sometimes a fresh key cut to the original code restores smooth operation, other times the cylinder needs to be serviced.
Is It the Battery or the Programming?
Before you assume the worst, rule out a dead battery. The Maxima proximity fob runs on a CR2032 coin cell, and a weak one is the most common reason a remote stops locking from a distance or makes you hold it against the start button to crank. A fresh cell often brings the fob fully back.
A true programming fault is different. If a new battery does not help, if the key turns or the button presses but the engine will not start, or if a security light stays lit, the problem is on the immobilizer side and the key needs to be re-paired to the car. That is also where verifying the KR5S180144014 versus KR5TXN4 fob matters, since the wrong one will not enroll.
Maxima Smart Key and Push-Button Start
From the 2009 generation onward the Maxima offers a proximity smart key with push-to-start, and it became standard for 2016-2023. As long as the fob is in your pocket or bag, the doors unlock on touch and the car starts with a button. When the system stops recognizing it, the cause is usually a weak coin cell first and a pairing fault second. Adding or replacing a proximity fob is a programming job, and we verify lock, unlock, trunk, and push-button start before we leave.
Local Maxima Help in Statesboro and Beyond
We serve Maxima drivers across Statesboro and all of Bulloch County, coming to homes, workplaces, and parking lots rather than asking you to come to us. Whether the car is parked along East Main Street downtown, near Fair Road, off Veterans Memorial Parkway, or out on a side road off US-301, we bring the service to the vehicle and usually arrive with the right parts for your year on the first visit.
Realistic Maxima Key Scenarios
Example. A driver downtown near East Main Street comes out to a 2018 Maxima that will not start with the smart key. We confirm the car uses the KR5TXN4 fob rather than the KR5S180144014, pair a new one on-site, and verify push-button start before they head out.
Example. A Georgia Southern student has a handed-down 2007 Maxima whose only NSN14 key finally cracked at the head and stopped reading. We cut a fresh blade, program the transponder, and recommend a spare so a single key is never the only key again.
Example. A commuter at Statesboro Crossing finds the remote on a 2012 Maxima no longer unlocks from across the lot. A weak CR2032 coin cell is the culprit, the proximity fob comes back to life with a fresh cell, and we confirm everything responds before they leave.
Before You Call: Maxima Checklist
- The year of your Maxima, which narrows down the blade, chip, and fob type immediately.
- The VIN, usually visible through the lower corner of the windshield, so we can confirm the exact part.
- Whether the car has a start button (proximity) or a key you physically turn (bladed transponder).
- On 2016-2023 cars, a look at the back of the fob, since these shipped as either the KR5S180144014 or KR5TXN4.
- How many working keys you have, since a spare from a working key is a different job than a lost-all-keys.
- A photo ID and the registration or title, so we can verify the vehicle is yours before programming a key.
Maxima Keys: Dealership or Locksmith?
The Nissan dealer can make a Maxima key, but for most years it means a tow or a drive to the dealership, a wait for an appointment, and a car out of your hands while it sits on their schedule. As a mobile locksmith we bring the blanks, 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 one we flag when we confirm your VIN, not after we arrive.
More Key and Lock Services
- all Nissan 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
Nissan Maxima head-to-head key comparisons
Deciding between the Nissan Maxima and a rival? These side-by-side guides break down each pairing:
- Nissan Maxima vs Chevrolet Impala key replacement
- Nissan Maxima vs Ford Taurus key replacement
- Nissan Maxima vs Toyota Avalon key replacement
Other full-size sedans we service
Cross-shopping the Nissan Maxima against other full-size sedans? We make and program keys for these comparable models too:
- Nissan Maxima vs Toyota Avalon key replacement
- Nissan Maxima vs Chevrolet Impala key replacement
- Nissan Maxima vs Chrysler 300 key replacement
- Nissan Maxima vs Ford Taurus key replacement
Frequently Asked: Maxima Keys
Can you make a Nissan Maxima key without the original?
Yes. For the large majority of Maxima years we make a key with none in hand by reading the immobilizer data and building 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.
How do I know which Maxima key I need?
It comes down to the model year. The 2004-2008 cars use an NSN14 bladed transponder, 2009-2015 added a proximity option, and 2016-2023 are push-to-start on either the KR5S180144014 or KR5TXN4 fob. We confirm the exact part by VIN.
Why does the right fob matter on a 2016-2023 Maxima?
Those years shipped with two different proximity fobs, the KR5S180144014 and the KR5TXN4, and they are not interchangeable. Ordering the wrong one is a common online mistake, so we verify the fob on your car before programming.
My Maxima fob stopped working. Is it broken?
Often not. The fob uses 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 fix it and the engine still will not start, the fob likely needs to be re-paired.
Why is my older Maxima key getting hard to turn?
On higher-mileage 2004-2008 cars that is usually a worn ignition cylinder rather than a bad key. Years of daily use wear the lock, so the NSN14 key sticks or will not turn even though it is the right key. 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 Maxima is parked across Statesboro and Bulloch County. Call (912) 209-6131 and we will confirm your year and fob by VIN before heading out so we arrive with the right parts.