How to Disable AFM for Free

Active Fuel Management (AFM) is a technology used in modern vehicles to improve fuel efficiency by deactivating some of the engine’s cylinders when they are not needed. While AFM can help save fuel, some drivers prefer to disable it due to concerns about potential engine problems and reduced performance. In this article, we will explore various methods to disable AFM for free, providing valuable insights and step-by-step instructions.

The Pros and Cons of AFM

Before diving into the methods of disabling AFM, it is important to understand the advantages and disadvantages of this technology.

Advantages of AFM

  • Improved fuel efficiency: AFM can reduce fuel consumption by deactivating cylinders when the engine is under light load conditions.
  • Reduced emissions: By using fewer cylinders, AFM can help lower the emissions produced by the vehicle.
  • Smooth driving experience: When AFM is active, the transition between cylinder activation and deactivation is seamless, resulting in a smooth driving experience.

Disadvantages of AFM

  • Potential engine problems: Some drivers have reported issues with AFM, such as lifter failure and excessive oil consumption.
  • Reduced performance: AFM can impact the overall performance of the vehicle, especially during acceleration and towing.
  • Increased wear and tear: Deactivating and reactivating cylinders can cause additional stress on engine components, potentially leading to premature wear and tear.

Methods to Disable AFM

Now that we have discussed the pros and cons of AFM, let’s explore some methods to disable it for free.

Method 1: Using a Tuning Device

One of the most effective ways to disable AFM is by using a tuning device. These devices allow you to modify the engine’s computer settings, including disabling AFM. Here are the steps to follow:

  1. Research and choose a compatible tuning device for your vehicle.
  2. Connect the tuning device to the OBD-II port of your vehicle.
  3. Follow the instructions provided by the tuning device manufacturer to disable AFM.
  4. Once AFM is disabled, disconnect the tuning device and start your vehicle to ensure the changes have taken effect.

Using a tuning device provides a reliable and reversible method to disable AFM. However, it is important to note that modifying the engine’s computer settings may void your vehicle’s warranty, so proceed with caution.

Method 2: Disconnecting the AFM Solenoids

Another method to disable AFM is by disconnecting the AFM solenoids. These solenoids control the activation and deactivation of the cylinders. Here’s how you can do it:

  1. Locate the AFM solenoids in your vehicle’s engine bay. They are usually located on the top of the engine.
  2. Disconnect the electrical connectors from each AFM solenoid.
  3. Securely tape the connectors to prevent them from coming into contact with any metal surfaces.

By disconnecting the AFM solenoids, you effectively disable AFM. However, keep in mind that this method may trigger a check engine light or other warning indicators on your dashboard.

Method 3: Using an AFM Disabler Plug

An AFM disabler plug is a device specifically designed to disable AFM without the need for any modifications or disconnections. Here’s how you can use an AFM disabler plug:

  1. Research and purchase an AFM disabler plug compatible with your vehicle.
  2. Locate the AFM connector, which is usually located near the intake manifold.
  3. Disconnect the AFM connector and plug in the AFM disabler.
  4. Start your vehicle and ensure that AFM is disabled by checking the dashboard for any warning indicators.

Using an AFM disabler plug is a simple and reversible method to disable AFM. However, it is important to choose a high-quality device from a reputable manufacturer to ensure compatibility and reliability.


Disabling AFM can be a personal preference for some drivers who prioritize engine longevity and performance over fuel efficiency. In this article, we explored three methods to disable AFM for free: using a tuning device, disconnecting the AFM solenoids, and using an AFM disabler plug. Each method has its own advantages and considerations, so it is important to choose the one that best suits your needs and vehicle.

Remember, disabling AFM may have implications on your vehicle’s warranty and could potentially trigger warning indicators on your dashboard. Proceed with caution and consult with a professional if you have any concerns or questions.


Q: Will disabling AFM improve my vehicle’s performance?

A: Disabling AFM may improve performance, especially during acceleration and towing. However, it is important to note that the impact on performance may vary depending on the vehicle and driving conditions.

Q: Can disabling AFM cause any damage to my engine?

A: While disabling AFM itself does not cause direct damage to the engine, it may increase wear and tear on certain components due to the constant activation of all cylinders. Regular maintenance and monitoring are recommended to ensure the engine’s health.

Q: Will disabling AFM void my vehicle’s warranty?

A: Modifying the engine’s computer settings, such as disabling AFM, may void your vehicle’s warranty. It is important to consult with your vehicle manufacturer or a qualified professional to understand the implications before making any modifications.

A: The legality of disabling AFM may vary depending on your location. It is important to research and understand the laws and regulations in your area before making any modifications to your vehicle.

Q: Can I re-enable AFM after disabling it?

A: If you choose to disable AFM using a tuning device or an AFM disabler plug, you can easily re-enable it by reversing the process. However, if you disconnect the AFM solenoids, you will need to reconnect them to re-enable AFM.

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