2016 Mercedes-Benz CLS63 AMG S Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2016 Mercedes-Benz CLS63 AMG S and Effective Repair Strategies

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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 2016 Mercedes-Benz CLS63 AMG S 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 2016 Mercedes-Benz CLS63 AMG S 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 2016 Mercedes-Benz CLS63 AMG S?

To effectively diagnose a vacuum leak in a 2016 Mercedes-Benz CLS63 AMG S, begin with a comprehensive visual inspection of the engine compartment. Look for any signs of damaged or disconnected vacuum hoses, focusing on areas where cracks or loose connections may be present, as these are common culprits for leaks. Once you've completed the visual check, start the engine and listen carefully for any hissing sounds, which can help you pinpoint the leak's location. If the source of the leak is still unclear, employing a smoke machine can be highly effective; by introducing smoke into the vacuum system, any escaping smoke will make leaks easily identifiable. Additionally, measuring vacuum levels with a vacuum gauge can provide valuable information, as a significant drop in pressure typically indicates a leak. Another practical method involves spraying soapy water on the vacuum hoses and connections while the engine is running; the formation of bubbles will signal escaping air. For a more thorough diagnosis, consider using professional diagnostic tools to check for error codes related to the vacuum system, which can provide deeper insights into the issue. By following this systematic approach, you can efficiently identify and resolve vacuum leaks, ensuring optimal performance of your vehicle.

What are the common problems associated with vacuum leaks in a 2016 Mercedes-Benz CLS63 AMG S?

When it comes to vacuum leaks in a 2016 Mercedes-Benz CLS63 AMG S, several common problems can significantly impact the vehicle's performance. One of the most noticeable symptoms is rough idling, where the engine may shake or vibrate due to an unstable air-fuel mixture. This instability can also lead to poor fuel efficiency, as the engine struggles to maintain the correct balance, often running either too rich or too lean. Additionally, a vacuum leak can trigger the check engine light, alerting drivers to an underlying issue that requires attention. Performance can also suffer, with drivers experiencing a loss of power during acceleration or when driving uphill, making the vehicle feel sluggish. Lastly, a hissing or whistling noise from under the hood can indicate a vacuum leak, serving as an audible warning that something is amiss. Addressing these issues promptly is crucial to maintaining the engine's health and ensuring the vehicle operates at its best.

How urgent is it to address a vacuum leak in a 2016 Mercedes-Benz CLS63 AMG S?

Addressing a vacuum leak in a 2016 Mercedes-Benz CLS63 AMG S is crucial for maintaining the vehicle's performance and safety. A vacuum leak can significantly impact fuel efficiency and engine performance, leading to a decrease in drivability that can affect your overall driving experience. If left unattended, the leak may cause further damage to other engine components, resulting in more extensive and costly repairs. The urgency of resolving this issue cannot be overstated, as neglecting it could lead to serious safety risks on the road. Therefore, it is highly advisable for DIY enthusiasts to diagnose and repair any vacuum leaks promptly, ensuring that the engine operates smoothly and efficiently while preventing potential complications down the line. Taking swift action not only preserves the vehicle's performance but also safeguards against future repair costs.

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