2018 Subaru BRZ Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2018 Subaru BRZ: Symptoms, Causes, and Repair Solutions

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Reviewed by
Aisha
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 2018 Subaru BRZ 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 2018 Subaru BRZ 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 2018 Subaru BRZ?

To effectively diagnose and fix a vacuum leak in your 2018 Subaru BRZ, start with a thorough visual inspection of the engine bay. Look for any signs of wear, such as cracked or disconnected vacuum hoses, which are common culprits. If the visual check doesn’t reveal any obvious issues, consider using a smoke machine to introduce smoke into the vacuum system; this method allows you to see where the smoke escapes, indicating the leak's location. Additionally, while the engine is running, listen for any hissing sounds that may signal a leak. Once you’ve identified the source, proceed to fix the issue by replacing any damaged hoses and ensuring all connections are secure. If the leak is minor, a vacuum hose repair kit can be a quick solution. After making the necessary repairs, it’s crucial to test the system to confirm that the vacuum leak has been successfully resolved, ensuring your vehicle runs smoothly.

What are the common causes of a vacuum leak in a 2018 Subaru BRZ?

Understanding the common causes of a vacuum leak in a 2018 Subaru BRZ is crucial for any DIY enthusiast looking to maintain their vehicle's performance. One of the primary culprits is worn or damaged vacuum hoses, which can deteriorate over time due to exposure to heat and engine vibrations. Additionally, loose or improperly connected hoses can create gaps that allow air to escape, leading to a vacuum leak. Another significant factor is the intake manifold gasket; if this component is faulty or damaged, it can disrupt the vacuum seal necessary for optimal engine function. Similarly, a cracked or damaged intake manifold can also be a source of leaks, compromising the engine's efficiency. Lastly, a malfunctioning Positive Crankcase Ventilation (PCV) valve can interfere with the vacuum system, resulting in leaks that affect engine performance. Regular inspections and timely maintenance of these components can help prevent vacuum leaks, ensuring your Subaru BRZ runs smoothly and efficiently.

How urgent is it to repair a vacuum leak in a 2018 Subaru BRZ?

Repairing a vacuum leak in your 2018 Subaru BRZ should be treated as a priority due to the significant impact it can have on your vehicle's performance and safety. A vacuum leak can lead to rough idling, stalling, and a noticeable decrease in power, which not only affects your driving experience but can also pose safety risks on the road. Additionally, the inefficiency caused by a vacuum leak can result in poor fuel economy, leading to increased costs at the pump. If left unaddressed, a vacuum leak can exacerbate existing issues and potentially damage other engine components, resulting in more extensive and costly repairs down the line. Therefore, taking prompt action to repair a vacuum leak is essential for maintaining the overall health of your vehicle, ensuring optimal performance, and preventing further complications that could arise from neglecting this seemingly minor issue.

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2018 Subaru BRZ Vacuum Leak: Causes & Repair Costs