Subaru Forester 2.0 Diesel Turbo: Problems, Replacement & Tips

Nov 13, 2025 by Alex Braham 63 views

Hey Subaru enthusiasts! Let's dive into the world of the Subaru Forester 2.0 diesel turbo. Whether you're facing some turbo troubles or just want to understand your car better, this guide is for you. We'll cover common issues, maintenance tips, and what to do when it's time for a replacement. Buckle up, and let’s get started!

Understanding the Subaru Forester 2.0 Diesel Turbo

The Subaru Forester 2.0 diesel turbo is a popular choice for those who want a blend of fuel efficiency and performance. This engine, known for its boxer configuration, offers a unique driving experience. The turbocharger plays a crucial role in boosting the engine's power, especially at lower RPMs, making it responsive and fun to drive. However, like any turbocharged engine, it requires proper care and attention to ensure longevity and optimal performance.

The Role of the Turbocharger: The turbocharger works by forcing more air into the engine cylinders, allowing it to burn more fuel and produce more power. This is especially beneficial in a diesel engine, where torque is king. A healthy turbocharger means better acceleration, improved fuel economy, and a smoother overall driving experience. But what happens when things go wrong? That’s what we’re here to explore.

Common Issues with the Turbocharger: Over time, several issues can plague the turbocharger in your Subaru Forester 2.0 diesel. These can range from minor inconveniences to major headaches that require immediate attention. Let's look at some of the most common problems:

Turbo Lag: Turbo lag is that annoying delay you feel between pressing the accelerator and the engine actually responding. While some turbo lag is normal, excessive lag can indicate a problem. This could be due to a malfunctioning wastegate, a leak in the intake system, or even a faulty sensor. Addressing turbo lag promptly can prevent further damage and restore your car's responsiveness.
Loss of Power: If you notice that your Forester isn't accelerating as quickly as it used to, or that it struggles to maintain speed on hills, it could be a sign of a failing turbocharger. A loss of power can be attributed to various issues, such as a clogged air filter, a faulty boost control solenoid, or internal damage to the turbocharger itself. Diagnosing the root cause is essential to get your car back to its peak performance.
Unusual Noises: Whining, whistling, or screeching noises coming from the engine bay are often telltale signs of turbocharger trouble. These noises can indicate worn bearings, damaged compressor wheels, or leaks in the turbocharger housing. Ignoring these noises can lead to more significant damage and costly repairs down the road. It's best to have your car inspected by a qualified mechanic as soon as you notice any unusual sounds.
Excessive Smoke: Blue or black smoke coming from the exhaust can be another sign of turbocharger issues. Blue smoke typically indicates that oil is leaking into the turbocharger and being burned in the engine, while black smoke suggests that the engine is running rich due to a lack of boost. Both of these conditions can lead to reduced fuel economy, poor performance, and potential engine damage. Addressing the underlying cause of the smoke is crucial to prevent further complications.
Oil Leaks: Turbochargers rely on a steady supply of oil for lubrication and cooling. If you notice oil leaks around the turbocharger or in the engine bay, it could indicate a problem with the turbocharger's oil seals or lines. Oil leaks can lead to reduced oil pressure, overheating, and ultimately, turbocharger failure. Regularly inspecting your car for oil leaks and addressing them promptly can help prevent more significant damage.

Maintenance Tips to Prolong Turbo Life

To keep your Subaru Forester 2.0 diesel turbo running smoothly, regular maintenance is key. Here are some essential tips to prolong the life of your turbocharger:

Regular Oil Changes: Use high-quality synthetic oil and change it according to Subaru's recommended intervals. Clean oil is crucial for lubricating the turbocharger's bearings and preventing wear.
Air Filter Maintenance: A clean air filter ensures that the turbocharger receives a steady supply of clean air. Replace the air filter regularly to prevent dirt and debris from damaging the turbocharger blades.
Cool-Down Period: After a long drive or heavy acceleration, let the engine idle for a minute or two before turning it off. This allows the turbocharger to cool down and prevents oil from coking inside the turbocharger.
Check for Leaks: Regularly inspect the turbocharger and surrounding components for oil or air leaks. Addressing leaks promptly can prevent more significant damage and costly repairs.
Proper Warm-Up: Avoid revving the engine excessively when it's cold. Allow the engine to warm up gradually before putting it under heavy load. This helps to protect the turbocharger from thermal stress and premature wear.

Signs You Need a Turbo Replacement

Sometimes, despite our best efforts, the turbocharger reaches the end of its life. Here are some signs that indicate it's time for a replacement:

Significant Power Loss: If your Forester feels sluggish and lacks power, even after addressing other potential issues, the turbocharger may be failing.
Loud and Persistent Noises: If the turbocharger is making loud and persistent whining, screeching, or grinding noises, it's likely that the bearings are worn and the turbocharger needs to be replaced.
Excessive Smoke: If you're seeing excessive blue or black smoke coming from the exhaust, even after addressing potential oil leaks or fueling issues, it could indicate that the turbocharger is severely damaged and needs to be replaced.
Turbocharger Failure Codes: If your car's computer is throwing turbocharger-related error codes, it's a clear sign that there's a problem with the turbocharger that needs to be addressed.

Step-by-Step Guide to Turbo Replacement

Replacing the turbo on a Subaru Forester 2.0 diesel can be a complex job, so if you're not confident in your mechanical skills, it's best to leave it to a professional. However, if you're up for the challenge, here's a step-by-step guide:

Gather Your Tools and Parts: Make sure you have all the necessary tools, including wrenches, sockets, screwdrivers, and a torque wrench. You'll also need a new turbocharger, gaskets, seals, and any other replacement parts recommended by the manufacturer.
Disconnect the Battery: Before starting any work on your car, disconnect the negative battery cable to prevent electrical shorts.
Remove the Air Intake: Disconnect the air intake hose from the turbocharger and remove the air filter housing to gain access to the turbocharger.
Disconnect the Oil and Coolant Lines: Carefully disconnect the oil and coolant lines from the turbocharger. Be prepared for some oil and coolant to spill, so have some rags or a drain pan handy.
Remove the Exhaust Downpipe: Disconnect the exhaust downpipe from the turbocharger. You may need to use penetrating oil to loosen any stubborn bolts.
Remove the Turbocharger: Unbolt the turbocharger from the exhaust manifold and carefully remove it from the engine bay.
Prepare the New Turbocharger: Before installing the new turbocharger, make sure it's properly lubricated. Prime the turbocharger by filling it with oil through the oil inlet port.
Install the New Turbocharger: Carefully install the new turbocharger onto the exhaust manifold and bolt it into place. Torque the bolts to the manufacturer's specifications.
Reconnect the Oil and Coolant Lines: Reconnect the oil and coolant lines to the turbocharger, making sure they're properly tightened and sealed.
Reconnect the Exhaust Downpipe: Reconnect the exhaust downpipe to the turbocharger and tighten the bolts securely.
Reconnect the Air Intake: Reconnect the air intake hose to the turbocharger and reinstall the air filter housing.
Reconnect the Battery: Reconnect the negative battery cable.
Start the Engine: Start the engine and let it idle for a few minutes to allow the turbocharger to lubricate properly. Check for any leaks and address them as necessary.

Choosing the Right Replacement Turbo

When it comes to replacing your Subaru Forester 2.0 diesel turbo, you have several options. You can go with a brand-new OEM (Original Equipment Manufacturer) turbocharger, a remanufactured turbocharger, or an aftermarket turbocharger. Here’s a quick rundown:

OEM Turbochargers: These are the same turbochargers that came with your car from the factory. They offer the best fit and performance but are typically the most expensive option.
Remanufactured Turbochargers: These are used turbochargers that have been rebuilt to like-new condition. They offer a good balance of performance and affordability.
Aftermarket Turbochargers: These are turbochargers made by third-party manufacturers. They can offer improved performance and features but may require modifications to fit properly.

Cost Considerations

The cost of replacing a Subaru Forester 2.0 diesel turbo can vary depending on several factors, including the type of turbocharger you choose, the cost of labor, and any additional parts or services required. Here's a general breakdown of the costs involved:

Turbocharger: The cost of a new turbocharger can range from $500 to $1500 or more, depending on the brand and type.
Labor: The cost of labor can range from $500 to $1000, depending on the mechanic's hourly rate and the complexity of the job.
Additional Parts and Services: You may also need to factor in the cost of gaskets, seals, oil, coolant, and other miscellaneous parts and services.

Tips for Finding a Reliable Mechanic

If you're not comfortable replacing the turbocharger yourself, it's essential to find a reliable mechanic who has experience working on Subaru vehicles. Here are some tips for finding a good mechanic:

Ask for Recommendations: Ask friends, family, or other Subaru owners for recommendations.
Check Online Reviews: Read online reviews to see what other customers have to say about the mechanic's work.
Look for Certifications: Choose a mechanic who is certified by the National Institute for Automotive Service Excellence (ASE).
Get a Written Estimate: Before authorizing any work, get a written estimate that includes a breakdown of the costs involved.

Conclusion

The Subaru Forester 2.0 diesel turbo is a fantastic engine that offers a great blend of performance and efficiency. By understanding the common issues, following proper maintenance practices, and knowing when it's time for a replacement, you can keep your Forester running smoothly for years to come. Whether you're a seasoned gearhead or a casual driver, we hope this guide has provided you with valuable information and insights into the world of Subaru turbochargers. Happy driving, and may your turbo always spool strong!