2013 Mercedes-Benz S350 Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2013 Mercedes-Benz S350 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 2013 Mercedes-Benz S350 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 2013 Mercedes-Benz S350 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 2013 Mercedes-Benz S350?

When diagnosing a vacuum leak in a 2013 Mercedes-Benz S350, it's essential to adopt a systematic approach that begins with the simplest methods before progressing to more complex diagnostics. Start with a thorough visual inspection of the hoses, gaskets, and intake manifold, looking for any signs of wear or damage. This initial step can often reveal obvious issues that are easy to fix. Next, listen for any hissing noises while the engine is running, as these sounds can indicate the presence of a leak. If you notice an increase in fuel consumption, this could also signal a vacuum leak, as the engine may be compensating for a lean condition. For a more precise diagnosis, consider using gauges to measure vacuum levels, which can help pinpoint leaks. Additionally, conducting a smoke test can visually highlight leaks by introducing smoke into the system, allowing you to see where it escapes. Finally, pressure testing can confirm the presence of leaks by monitoring how well the system holds pressure. By following this structured approach, you can effectively identify and address vacuum leaks, ensuring your vehicle runs smoothly and efficiently.

What are the common problems associated with vacuum leaks in a 2013 Mercedes-Benz S350?

Vacuum leaks in a 2013 Mercedes-Benz S350 can significantly impact the vehicle's performance, leading to a range of issues that DIY enthusiasts should be aware of. One of the most noticeable symptoms is poor engine running conditions, which can manifest as rough idling, stalling, or decreased acceleration. These problems often stem from the deterioration of hoses and gaskets that transport vacuum pressure throughout the engine. Over time, these components can develop cracks or leaks, allowing air to enter the system improperly. Additionally, drivers may hear unusual noises, particularly from the passenger side of the trunk, indicating a potential vacuum leak. Addressing these leaks promptly is crucial, as they can lead to further complications, including damage to other engine components. Regular inspections and maintenance can help identify these issues early, ensuring that your S350 runs smoothly and efficiently.

How urgent is it to address a vacuum leak in a 2013 Mercedes-Benz S350?

Addressing a vacuum leak in your 2013 Mercedes-Benz S350 is not just a matter of routine maintenance; it is an urgent necessity that can significantly impact your vehicle's performance and safety. A vacuum leak can trigger the check engine light, indicating that your engine is not operating at its optimal level. This issue can lead to a decrease in power output and fuel efficiency, making your driving experience less enjoyable and more costly. Moreover, the vacuum system is integral to the braking system; a malfunction can compromise braking efficiency, posing a serious safety risk. Ignoring these symptoms can result in more extensive damage and higher repair costs down the line. Therefore, it is crucial to address any signs of a vacuum leak promptly, ensuring your Mercedes-Benz remains reliable and safe on the road.

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