2020 Mercedes-Benz S63 AMG Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2020 Mercedes-Benz S63 AMG and Effective Repair Strategies

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Reviewed by
Bo Fader
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 Mercedes-Benz S63 AMG 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 Mercedes-Benz S63 AMG 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.

Problems with the intake manifold gasket can create the following symptoms:

  • Illuminated check engine light
  • Erratic engine performance
  • Oil and coolant leaks
  • Poor gas mileage
  • Stalling

» LEARN MORE: Intake manifold gasket symptoms

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 a vacuum leak in a 2020 Mercedes-Benz S63 AMG?

To effectively diagnose a vacuum leak in a 2020 Mercedes-Benz S63 AMG, begin with a comprehensive visual inspection of the engine bay. Look for any signs of damaged or disconnected vacuum hoses, focusing on areas with cracks, holes, or loose connections that may suggest a leak. Once you've completed the visual check, start the engine and listen for any hissing noises, as these sounds can help you identify the general area of the leak. If the source of the leak is still unclear, employing a smoke machine can be highly effective; this tool introduces smoke into the vacuum system, allowing you to visually track where it escapes and accurately pinpoint the leak's location. Another practical method involves spraying soapy water on the vacuum hoses and connections while the engine is running; if there is a leak, the escaping air will create bubbles in the soapy water, making the leak evident. Lastly, using a diagnostic scanner to check for any error codes related to the vacuum system can provide additional insights into potential issues. By following this systematic diagnostic approach, you can efficiently identify and resolve vacuum leaks, ensuring your vehicle maintains optimal performance.

What are the common causes of a vacuum leak in a 2020 Mercedes-Benz S63 AMG?

Understanding the common causes of vacuum leaks in a 2020 Mercedes-Benz S63 AMG is crucial for any DIY mechanic looking to maintain their vehicle's performance. One of the primary culprits is damaged or deteriorated vacuum hoses, which can crack or become loose over time, leading to significant leaks. Additionally, faulty intake manifold gaskets can also be a source of vacuum leaks, as wear and tear can compromise their integrity. Another potential issue is a malfunctioning vacuum pump, which may fail to maintain adequate vacuum pressure, resulting in leaks throughout the system. It's also important to check for loose or damaged fittings, as these can easily contribute to vacuum loss. Lastly, a cracked or damaged vacuum reservoir can severely impact the vehicle's performance, making it essential to inspect this component regularly. By being aware of these common problems, DIY enthusiasts can take proactive steps to diagnose and repair vacuum leaks, ensuring their S63 AMG runs smoothly and efficiently.

How urgent is it to address a vacuum leak in a 2020 Mercedes-Benz S63 AMG?

Addressing a vacuum leak in your 2020 Mercedes-Benz S63 AMG is crucial for maintaining optimal vehicle performance and preventing further complications. While it may not seem as urgent as other mechanical issues, neglecting a vacuum leak can lead to significant problems, including decreased fuel efficiency, reduced engine power, and overall drivability concerns. Over time, these leaks can exacerbate wear on engine components, potentially resulting in costly repairs that could have been avoided with timely intervention. For DIY enthusiasts, it’s essential to recognize the symptoms of a vacuum leak, such as rough idling or hissing sounds, and to take action quickly. By diagnosing and repairing the leak yourself or seeking professional help, you can ensure that your engine runs smoothly and efficiently, safeguarding your investment and enhancing your driving experience.

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