Key Fob Not Working? Expert Guide On How To Replace Battery In Your Mustang [Updated On- 2025]

To replace the battery in a 2017 Ford Mustang key fob, use a CR2025 battery. Step 1: Press the release button to split the fob. Step 2: Use a coin or tool to open it. Step 3: Remove the old battery, insert the new one, and snap it back together. This process takes about 10-15 minutes.

Remove the old battery by pushing down on the side or prying it out gently. Insert the new battery, ensuring that the positive side faces up. Align the casing properly and snap it back together. Once reassembled, test the key fob to confirm that it works correctly.

If the fob still doesn’t function, other issues may need attention. Now that you know how to replace the battery, let’s explore additional troubleshooting steps. These steps can help identify if there is a deeper issue with your key fob or your Mustang’s security system.

# Table of Contents

What Is a Key Fob, and Why Is It Essential for My 2017 Mustang?

A key fob is a remote control device that enables keyless entry and ignition for vehicles, including your 2017 Mustang. It allows users to unlock doors, arm alarms, and start the engine without inserting a physical key.

According to the International Organization for Standardization (ISO), key fobs enhance security and convenience in automotive applications. The ISO defines them as “Devices designed to enable access control and security functions.”

Key fobs utilize radio frequency identification (RFID) technology to communicate with the vehicle’s security system. They often include buttons for various functions, such as locking or unlocking doors, opening the trunk, and activating panic alarms. Many modern key fobs also have proximity features that allow keyless start.

The National Highway Traffic Safety Administration (NHTSA) suggests that key fobs improve vehicle security and user convenience. They also play a role in roadside assistance and emergency lock-out situations.

Key fobs can malfunction for various reasons, including low battery power, water damage, or internal component failure. A dead battery is often the most common issue, necessitating replacement.

Statistics indicate that nearly 25% of vehicle thefts involve bypassing traditional key methods, making key fobs crucial for security. Enhanced encryption in key fobs is projected to decrease theft incidents in newer models.

The consequences of malfunctioning key fobs include lockouts and compromised vehicle security. Enhanced security features have made modern vehicles more vulnerable if the key fob fails.

From a societal perspective, key fobs contribute to reduced vehicle theft rates. Economically, they often increase insurance premiums due to their advanced security features.

For ensuring a functional key fob, regular battery checks and safeguarding against water damage are essential measures. The NHTSA recommends routine maintenance and verifying that software updates are applied to your vehicle’s system.

Using spare keys, considering keyless entry systems, and investing in added security measures can mitigate risks associated with key fob issues. Expert recommendations include having a backup key fob and consulting your vehicle’s manual for troubleshooting tips.

How Can I Tell if the Battery in My 2017 Mustang Key Fob Is Dead?

You can tell if the battery in your 2017 Mustang key fob is dead by observing whether the key fob functions properly, examining the range of your key fob signal, and performing a simple battery test.

When the key fob does not work, check the following:

No Response: If the key fob does not respond when you press any button, the battery may be dead. This includes functions like unlocking doors or starting the vehicle.
Reduced Range: If the key fob works only when you are very close to the car, the battery may be weak. Normally, a key fob should work from several meters away.
Low Battery Indicator: Some modern key fobs have a low battery warning light. If this light activates, it means the battery needs replacement.
Manual Testing: You can perform a battery test by opening the key fob. If there is corrosion on the battery contacts or if the battery appears swollen, it indicates a need for replacement.

These indicators can help determine the battery status of your key fob, ensuring you can use it effectively. Regular checks can prevent unexpected battery failures.

What Tools Do I Need to Successfully Replace the Battery in My 2017 Mustang Key Fob?

To successfully replace the battery in your 2017 Mustang key fob, you need a few specific tools and materials.

Small flathead screwdriver
New CR2032 battery
Clean, flat workspace
Optional: tweezers for battery placement

These tools are essential for the process. While these are commonly recommended, some users prefer using other tools or methods. As an example, some individuals find that using a spudger tool provides better grip without scratching. Others argue that a precision knife can also be helpful for carefully prying open the fob without causing damage.

Now, let’s delve deeper into each of these essential tools.

Small Flathead Screwdriver: A small flathead screwdriver is crucial for opening the key fob. This tool allows you to gently pry the fob apart without damaging it. When disassembling, it is essential to apply even pressure to avoid breakage.
New CR2032 Battery: The CR2032 battery is the specific type required for the 2017 Mustang key fob. This lithium battery is widely available in stores or online. It is essential to ensure you are using a high-quality battery for optimal performance. Low-quality batteries may not work properly or might drain quickly.
Clean, Flat Workspace: A clean, flat workspace ensures that you can manage and organize small parts like screws and components. This minimizes the risk of losing pieces during the replacement process.
Optional: Tweezers for Battery Placement: Tweezers can be useful, particularly when inserting the new battery. They allow for better handling of the small battery and ensure correct placement in the fob without risking contact with your fingers, which can sometimes lead to discharge of the battery.

In conclusion, these tools will make the battery replacement process of your 2017 Mustang key fob smoother and more efficient.

How Do I Open My 2017 Mustang Key Fob to Access the Battery?

To open your 2017 Mustang key fob and access the battery, follow the steps to ensure proper disassembly without damaging the device.

First, locate the small groove on the side of the key fob. This groove is designed for inserting a tool. Next, use a thin object, such as a flathead screwdriver or a coin, to gently pry open the key fob. Be careful during this process to avoid scratching the surface or breaking the plastic clips that hold the two halves of the fob together. Once you have pried it open, you will see the battery inside.

Locate the groove: The groove is typically situated along the seam of the key fob.
Insert a thin object: Use a flathead screwdriver or a coin to carefully insert into the groove.
Pry gently: Apply gentle pressure to separate the two halves of the key fob. Make sure not to use excessive force.
Access the battery: After successfully opening the fob, locate the battery. It is usually a small round battery labeled with a code like CR2032.
Replace the battery: Remove the old battery by lifting it out of its compartment. Insert the new battery, ensuring the correct orientation, usually with the “+” side facing up.

After replacing the battery, align the two halves of the fob and press them together until you hear a click, confirming they are securely closed. Following these steps helps ensure your key fob functions properly again.

What Type of Battery Should I Use for My 2017 Mustang Key Fob?

The 2017 Mustang key fob uses a CR2032 battery type.

Battery Type:
– CR2032 Lithium Coin Cell
Varieties:
– Different brands (Energizer, Panasonic, Duracell)
– Standard vs. rechargeable options
Opinions:
– Some prefer name-brand batteries for reliability.
– Others choose generic batteries to save costs.

Choosing the right battery involves understanding these options and perspectives to ensure your key fob functions properly.

Battery Type:
The 2017 Mustang key fob requires a CR2032 lithium coin cell battery. This battery type is widely used in various electronic devices, including key fobs, watches, and small gadgets. According to Duracell, CR2032 batteries have a nominal voltage of 3 volts, making them suitable for devices requiring stable and long-lasting power.
Varieties:
When selecting a CR2032 battery, various options are available. Battery brands such as Energizer, Panasonic, and Duracell specialize in coin cells, providing quality assurance and reliability. There are also standard versions that are non-rechargeable and some rechargeable alternatives. For example, some users prefer rechargeable versions for the convenience of reusing batteries, although they may have a slightly reduced lifespan compared to standard models.
Opinions:
User opinions vary on battery selection. Some vehicle owners emphasize the importance of using name-brand batteries for optimal performance and reliability. Trusted brands have a reputation for longer-lasting products, which can reduce the frequency of replacements. Conversely, some support the use of generic batteries, stating that they function similarly at a more affordable price. According to a consumer study by Consumer Reports in 2019, while leading brands often outperform generics in tests, many users report satisfactory experiences with less-known brands.

How Can I Safely Replace the Battery in My 2017 Mustang Key Fob?

To safely replace the battery in your 2017 Mustang key fob, follow these steps: gather necessary tools, open the key fob, remove the old battery, install the new battery, and reassemble the key fob.

Gather necessary tools: You will need a small flathead screwdriver and a new CR2032 battery. The CR2032 is a lithium battery commonly used in key fobs and watches.
Open the key fob: Locate the seam along the edge of the fob. Insert the flathead screwdriver gently into the seam and twist it to pry the fob apart. Be careful to avoid damaging the plastic shell.
Remove the old battery: Once the fob is open, identify the old battery. Take note of the battery’s orientation, as the positive (+) side must be facing up during replacement. Use the screwdriver to gently lift and remove the old battery from its compartment.
Install the new battery: Place the new CR2032 battery into the compartment. Ensure the positive (+) side is oriented the same way as the old battery. Press down gently to secure it in place.
Reassemble the key fob: Align the two halves of the key fob and press them together until they click. Make sure the fob is securely closed and that there are no gaps.

Following these steps will ensure your Mustang key fob operates properly. Regularly changing the battery helps maintain functionality and avoid unexpected failures.

How Can I Verify That the New Battery Works in My 2017 Mustang Key Fob?

To verify that the new battery works in your 2017 Mustang key fob, you can follow a few straightforward steps.

First, make sure the battery is correctly installed. Check the positive and negative terminals on the battery to ensure they align with the markings inside the key fob. Next, try to operate the key fob by pressing the buttons. If the doors lock and unlock, the battery works. If not, you may need to replace the battery again or check for other issues.

Battery Installation: Ensure the battery is correctly oriented. The positive (+) side should align with the positive terminal inside the key fob. Incorrect installation can prevent the fob from working properly.
Functionality Test: Press any button on the key fob. If the locking or unlocking mechanism engages, the battery is functioning. If nothing happens, further troubleshooting is needed.
Range Test: Stand a short distance from your car, around 10-15 feet. Press the button on the key fob. If the fob works at this distance, it indicates a good battery. If it only works when close to the vehicle, further investigation may be required.
Visual Inspection: Look for any physical damage to the key fob, such as cracks. Damaged fobs may not function even with a new battery.
Alternate Battery Check: If the key fob still does not work, try using a multimeter to test the battery’s voltage. A fully charged battery should read around 3 volts. If it reads lower, it may be defective.

By following these steps, you can effectively verify whether your new battery is operating correctly in your 2017 Mustang key fob.

What Steps Should I Take If My 2017 Mustang Key Fob Still Doesn’t Function After Battery Replacement?

If your 2017 Mustang key fob still doesn’t function after a battery replacement, follow these steps to troubleshoot the issue.

Check Battery Orientation
Reprogram the Key Fob
Inspect for Damage
Verify with Spare Key Fob
Consult Owner’s Manual
Seek Professional Assistance

These steps offer various solutions to address the key fob malfunction. Now, let’s explore each option in detail to understand the potential fixes.

Check Battery Orientation: Checking the battery orientation can fix issues with the key fob. Installing the battery incorrectly can prevent the fob from working. Ensure that the positive (+) and negative (-) sides match the symbols in the key fob compartment.
Reprogram the Key Fob: Reprogramming the key fob may restore its functionality. Certain key fobs, including those for the 2017 Mustang, require synchronization after battery replacement. The process typically involves using the ignition key in a specific sequence. Refer to the owner’s manual for the exact steps.
Inspect for Damage: Inspecting the key fob for physical damage is crucial. Look for cracks, broken buttons, or water damage. Any visible damage may block the fob’s signals. If damage is found, you may need to replace the key fob entirely.
Verify with Spare Key Fob: If you have a spare key fob, test it to determine if the issue lies with the original fob or the vehicle itself. If the spare works, then the original fob is likely defective. If not, the car’s receiver may be malfunctioning.
Consult Owner’s Manual: Consulting the owner’s manual can provide specific troubleshooting tips relevant to your Mustang. The manual often contains details on key fob functions and possible solutions for common issues.
Seek Professional Assistance: If the above steps do not resolve the issue, seek professional assistance. Contact a Ford dealership or a certified locksmith for expert help. They have the tools and knowledge to diagnose and fix complex issues with key fobs.

Following these strategies will help you effectively address a malfunctioning key fob for your 2017 Mustang.

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