How to Reset DPF Light on Subaru: A Step-By-Step Guide to Improving Your Car’s Health

Subaru owners who have seen the DPF light on their vehicle’s dashboard may not know what it means. The DPF light is a warning that indicates that the Diesel Particulate Filter (DPF) has become clogged and needs to be reset. If left unattended, it can lead to engine performance issues and other problems. In this article, we will provide a step-by-step guide on how to reset the DPF light on a Subaru and offer essential tips to keep your vehicle healthy.

What is DPF?

DPF stands for Diesel Particulate Filter. It is an exhaust system component that captures and filters soot, smoke, and other hazardous particles that come from the engine. It is a crucial component that helps reduce air pollution and improve the engine’s overall performance. However, over time, the DPF can become clogged with soot and debris, leading to reduced engine power and increased fuel consumption.

Reasons for DPF Light

The DPF light can turn on for several reasons, including driving habits, filter clogging, and sensor issues. The most common reasons why the DPF light turns on are short driving trips, slow driving, and traffic jams. These situations cause the DPF to filter its contents less effectively, leading to the filter becoming clogged.

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Importance of Resetting DPF Light

Resetting the DPF light is crucial to maintaining healthy engine performance. A clogged DPF can lead to critical engine components’ failure, resulting in expensive repairs. It is essential to reset the DPF light immediately to avoid more significant problems that can damage the engine permanently.

How to Reset DPF Light on Subaru

Resetting the DPF light on a Subaru is straightforward and can be done with the following easy steps:

  1. Start by ensuring the car is in park or neutral and the parking brake engaged.

  2. Locate the OBD-II port, which is usually located underneath the steering wheel. It is typically a trapezoidal shape that looks like this:

  3. Plug the OBD-II scanner into the port. Turn the ignition key to the "on" position, but do not start the engine.

  4. Wait for the scanner to identify the vehicle’s information, and select the DPF reset option. Follow the prompts on the scanner to complete the process.

  5. Turn off the ignition and unplug the scanner from the port. Start the vehicle and check if the DPF light has turned off.

Preventing DPF Light from Coming Back On

Preventing the DPF light from coming back on can be achieved by following these tips:

  • Take your Subaru on longer drives at higher speeds regularly. High speeds help the DPF burn off collected soot and debris more efficiently.
  • Avoid driving in traffic jams or driving short distances. This type of driving does not give the DPF enough time to function correctly.
  • Regularly service your vehicle. A well-maintained engine is less likely to cause DPF issues.
  • Use high-quality fuel that contains lower amounts of sulphur. Sulphur can quickly clog the DPF filter.
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Frequently Asked Questions (FAQ)

What Does It Mean If My DPF Light Is Flashed?

If your DPF light is flashing, it means that there is a severe problem with your Diesel Particulate Filter. It requires immediate attention before driving your vehicle as driving with a flashing DPF light can cause significant engine damage.

Do I Need to Replace DPF When the Light is ON?

Not necessarily. Resetting the DPF light and following the tips provided in this article can often resolve the issue. However, if the DPF light continues to turn on, it may indicate a more severe problem, and it’s best to take your vehicle to a qualified mechanic for repair.

Can I Still Drive My Vehicle with the DPF Light ON?

You can still drive your vehicle, but it’s not recommended. Driving with the DPF light on can cause significant damage to your engine and other critical components.

Final Thoughts

Resetting the DPF light on a Subaru is an essential aspect of vehicle maintenance that contributes to engine performance and longevity. By regularly maintaining your vehicle and following our tips, you can prevent DPF issues from occurring and keep your Subaru running smoothly for years to come.

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Alton Brobst

As a longtime Subaru enthusiast, Alton brings a wealth of knowledge and experience to our blog. From his early days of tinkering with engines to his current role as a certified Subaru technician, Alton has seen it all when it comes to Subarus. When he's not working on cars, he enjoys hiking and exploring the great outdoors.

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