2020 Subaru WRX Has A Vacuum Leak

Troubleshooting Vacuum Leak Issues in Your 2020 Subaru WRX: Symptoms, Causes, and Solutions

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Leaking Vacuum Hoses
0%
30% chance it's the
Leaking Gaskets and Seals
0%
20% chance it's the
Bad Actuators and Valves
0%
10% chance it's
Something else
The most common reasons a 2020 Subaru WRX has a vacuum leak are leaking vacuum hoses, leaking gaskets and seals, or bad actuators and valves.
  • Leaking Vacuum Hoses: A cracked or disconnected vacuum hose can lead to a loss of engine vacuum, resulting in poor engine performance and increased fuel consumption.
  • Leaking Gaskets and Seals: Aged or damaged gaskets and seals can lead to fluid leaks, resulting in loss of engine oil or coolant and potential engine damage.
  • Bad Actuators and Valves: A malfunctioning actuator or valve can disrupt the proper operation of the vehicle's systems, leading to issues such as poor engine performance or erratic behavior of components like the HVAC system.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Subaru WRX has a vacuum leak?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

What are the steps to diagnose and fix a vacuum leak in a 2020 Subaru WRX?

When tackling a vacuum leak in your 2020 Subaru WRX, it's essential to adopt a systematic diagnostic approach. Begin with a thorough visual inspection of the engine bay, focusing on vacuum hoses for any signs of wear, such as cracks or disconnections. This initial step can often reveal obvious issues that are easy to fix. Next, start the engine and listen carefully for any hissing sounds, which can indicate the presence of a leak. If these methods do not yield results, consider using a smoke machine, as it can effectively pinpoint the exact location of the leak by revealing smoke escaping from the compromised area. Once you have identified the source, proceed to fix the leak by replacing any damaged hoses and ensuring that all connections are tight and secure. For minor leaks, a vacuum hose repair kit can be a quick and effective solution. However, if you find yourself unable to locate or resolve the issue, seeking assistance from a professional mechanic is a prudent choice to ensure your vehicle runs smoothly. By following this structured approach, you can efficiently diagnose and repair a vacuum leak, enhancing the performance of your Subaru WRX.

What are the common causes of a vacuum leak in a 2020 Subaru WRX?

When diagnosing a vacuum leak in a 2020 Subaru WRX, it's essential to understand the common problems that can arise within the vehicle's vacuum system. One of the most frequent culprits is damaged vacuum hoses, which can develop cracks or wear over time, leading to a loss of vacuum pressure. Additionally, a faulty intake manifold gasket can compromise the integrity of the system, resulting in performance issues. It's also important to check for loose or improperly sealed components, such as the throttle body and intake manifold, as these can create gaps that allow air to escape. Regular inspection of vacuum lines is crucial, as they can deteriorate and crack, further contributing to leaks. Lastly, a malfunctioning Positive Crankcase Ventilation (PCV) valve can disrupt the flow of gases and lead to vacuum leaks. By being aware of these common issues and conducting routine maintenance, Subaru WRX owners can effectively manage and prevent vacuum leak problems, ensuring optimal vehicle performance.

How urgent is it to repair a vacuum leak in a 2020 Subaru WRX?

Repairing a vacuum leak in your 2020 Subaru WRX should be treated as a priority due to the immediate and long-term effects it can have on your vehicle's performance. A vacuum leak can cause rough idling, decreased fuel efficiency, and even engine misfires, which not only affect your driving experience but can also lead to more severe engine damage if left unaddressed. The urgency of fixing this issue cannot be overstated; neglecting it may result in costly repairs down the line, as the engine struggles to compensate for the imbalance created by the leak. By addressing a vacuum leak promptly, you not only enhance the overall health and longevity of your WRX but also ensure that it operates smoothly and efficiently. Therefore, if you notice any symptoms of a vacuum leak, such as unusual sounds or changes in engine performance, it is advisable to take action quickly to avoid further complications.

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