How to Fix Key System Error Nissan Sentra 2019

The Nissan Sentra 2019 is a reliable and popular sedan known for its comfortable ride and modern features. However, like any other complex machinery, it may encounter issues from time to time. One of the frustrating problems that some Nissan Sentra 2019 owners have reported is the “Key System Error.” When faced with this error, the car may refuse to start or respond to keyless entry commands, leaving drivers stranded and worried.

In this blog post, we will delve into the possible causes behind this error and provide you with some effective solutions to fix it.

Understanding the Key System Error

The Key System Error in the Nissan Sentra 2019 is generally associated with the vehicle’s key fob or the keyless entry system. The error message might appear on the dashboard or infotainment screen, indicating a problem with the system’s functionality. Several reasons could trigger this error, including a dead or malfunctioning key fob battery, a faulty key fob, issues with the keyless entry system, or even problems with the car’s battery or immobilizer.

Step-by-Step Solutions to Fix Key System Error Nissan Sentra 2019

  1. Check the Key Fob Battery

The first and easiest step to troubleshoot the Key System Error is to check the battery of your key fob. A weak or depleted battery could be the culprit.

Follow these steps to check and replace the battery if necessary:

  • a. Locate the small groove or opening on the key fob and use a small flat-head screwdriver or a coin to gently pry it open.
  • b. Take out the old battery and replace it with a new one of the same type (usually a CR2032 battery). Make sure the positive (+) side is facing up.
  • c. Snap the key fob back together and try starting the car or using the keyless entry function.
  1. Reprogram the Key Fob

If replacing the battery didn’t resolve the issue, there might be a synchronization problem between the key fob and the car’s immobilizer system. Reprogramming the key fob can help reestablish the connection. Here’s how:

  • a. Enter your car and close all doors, windows, and the trunk.
  • b. Insert your key into the ignition and turn it to the “On” position without starting the engine.
  • c. Lock the doors using the power lock button on the driver’s side door.
  • d. Insert the key into the ignition again and turn it to the “Off” position.
  • e. Repeat steps c and d, locking and unlocking the doors two more times (a total of three times).
  • f. Remove the key from the ignition, and the key fob should now be reprogrammed.
  1. Verify the Keyless Entry System

If reprogramming the key fob did not fix the issue, it’s essential to verify the keyless entry system’s functionality. This may require professional diagnostics and repairs, so consider visiting an authorized Nissan service center or a qualified automotive locksmith with experience in Nissan vehicles.

  1. Check the Car Battery and Immobilizer

If all else fails, it’s worth inspecting the car’s battery and the immobilizer system. A weak or failing car battery can cause communication issues with various vehicle systems. Similarly, a faulty immobilizer can prevent the car from recognizing the key fob and trigger the Key System Error.

How Do You Reset a Nissan 2019 Key Fob?

If you need to reset your Nissan 2019 key fob, there are a few things you’ll need to do.

First, locate the small button on the back of the key fob. This is usually located near the bottom. Once you’ve found it, press and hold it for about 15 seconds.

After that, release the button and wait for the key fob to reset itself. You should see a small light on the front of the key fob flash when it’s finished resetting.

If it doesn’t seem to be working, try again from step one.

What Does Key System Fault Mean?

If your car starts displaying a “key system fault” error message, it means that there is a problem with the keyless entry system. This can be caused by a number of different things, such as a dead battery in the key fob, a problem with the immobilizer system, or even just dirt and debris build-up on the key fob’s contact points. If you are experiencing this issue, the first thing you should do is try to replace the batteries in your key fob.

If that doesn’t solve the problem, then you’ll need to take your car to a dealer or qualified mechanic to have them diagnose and repair the issue. In some cases, simply cleaning the contact points on the key fob can fix the problem.

Why Won’T My Nissan Recognize My Key?

If your Nissan won’t recognize your key, it could be for a variety of reasons. Here are a few things to check: – Make sure the battery in your key fob is fresh.

If it’s been a while since you’ve replaced it, try doing that first. – If your car has an immobilizer system, make sure the antenna around the ignition is not blocked by anything. This could prevent the signal from reaching the key and cause it to not be recognized.

– Sometimes dirt or debris can build up on the contact points inside the ignition cylinder. Try cleaning these off with some WD-40 or other contact cleaner and see if that does the trick.

How Do You Reprogram a 2019 Nissan Key Fob Push Start?

If your Nissan has a push button start, you may be wondering how to reprogram the key fob. Here’s a quick guide on how to do just that:

First, open the door and sit in the driver’s seat.
Next, insert the key into the ignition and turn it to the “On” position (but don’t start the engine). Once the key is in the “On” position, press and hold down both the “Lock” and “Unlock” buttons on your key fob for about 5 seconds. After 5 seconds have passed, you should see a message on your dash telling you that the system is now ready to learn your new key fob.

Now, simply press and hold down the “Lock” button on your new key fob for about 2 seconds. You should see another message confirming that your new key fob has been programmed successfully. That’s it!

You can now use your new key fob to start your Nissan with ease.

How to Fix Key System Error Nissan Altima 2019

If you’re the owner of a Nissan Altima from the 2019 model year, you may have experienced a “key system error” message appearing on your vehicle’s display. This can be a frustrating issue, but fortunately there are some steps you can take to fix it.

First and foremost, if your Nissan Altima is still under warranty, contact your local dealer and they should be able to help you out at no cost.

If your vehicle is no longer under warranty, then you’ll need to take matters into your own hands. The most likely cause of the key system error message is a dead or dying battery in your key fob. To test this theory, simply remove the key fob from its slot on the side of the steering column and insert it into another slot (if available).

If the message goes away, then that confirms that the battery is indeed the problem. To fix it, simply open up the key fob and replace the old battery with a new one. You can find replacement batteries at most electronics stores or online retailers.

Once you’ve replaced the battery, re-insert it into the slot on your steering column and hopefully that will clear up the key system error message for good!


Nissan Sentra owners have reported a problem with the key system error on their 2019 models. The error message appears when trying to start the engine, and it can be caused by a variety of things, including a dead battery, loose connection, or faulty key fob. There are a few things you can try to fix the problem yourself, but if the problem persists, it’s best to take your car to a Nissan dealer for service.