2017 Mercedes-Benz S550e Engine Makes A Ticking Noise

Ticking Noises in 2017 Mercedes-Benz S550e Engine: Causes and Solutions

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
12% chance it's the
Exhaust Leak
0%
88% chance it's
Something else
The most common reasons a 2017 Mercedes-Benz S550e engine makes a ticking noise are low oil level or pressure, an issue with the ignition system, or an exhaust leak.
  • Exhaust Leak: A damaged exhaust manifold or a loose connection in the exhaust system can cause an exhaust leak, resulting in increased noise and potential loss of engine power.
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 2017 Mercedes-Benz S550e engine makes a ticking noise?

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.

If the drive belt idler pulley fails, there will be a very audible chirping noise from the front of the engine. This is because the idler pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to slip off. If the belt falls off, the accessory that it drives will no longer function. For instance, if the alternator belt idler pulley fails, the alternator may stop functioning. Also if the pulley begins to wobble, allowing slack in the belt, it will make an extremely loud squeaking or screeching noise, especially on cold starts. This is the belt slipping on the crankshaft pulley, and will require belt replacement once the idler pulley is replaced.

If the drive belt tensioner fails, there will be a very audible chirping, grinding, or rattling noise from the front of the engine. This is because the tensioner pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to lose tension, or break. If the belt falls off, the accessory that it drives will no longer function. Also, if the tensioner spring fails, allowing slack in the belt, it may make an extremely loud squeaking or screeching noise combined with a rattle as the tensioner bounces back and forth under load. The squealing noise is the belt slipping on the crankshaft pulley, and will require belt replacement once the belt tensioner is replaced.

An engine leaking oil does not always make a puddle on the ground. A burning smell may be noticed from the front of the vehicle after driving. This is because engine oil leaks may fall onto hot engine components, especially the exhaust manifold, and burn off before making it to the ground. This poses a risk to the engine because the leak going unnoticed may deplete the engine oil reserve, and lead to an oil starvation issue. Some engine oil leaks only occur while the engine is running, so the leak may be larger than the small spot on the ground makes it seem.

Noises can be accompanied by many annoying or worrisome sensations. Consider the noise of grinding brakes, the noise sounds much like the brake pedal and steering wheel feel. This is important, as random noises can be difficult to replicate without knowing when the sound occurs, what must be done to make the sound, and what sound it is. Any professional technician can replicate and diagnose most noises, but to ensure the vehicle is more quickly diagnosed, make sure you tell your technician these three pieces of information.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What are the potential causes of a ticking noise in the engine of a 2017 Mercedes-Benz S550e, and how should I diagnose them?

When diagnosing a ticking noise in the engine of a 2017 Mercedes-Benz S550e, it's essential to adopt a systematic approach that prioritizes simpler solutions before delving into more complex issues. Start by checking the engine oil level, as low oil can lead to inadequate lubrication and result in ticking sounds. If the oil level is sufficient, inspect the valve lifters for wear, as these components can deteriorate over time and may need replacement. Next, examine the fuel injectors for any signs of malfunction, as faulty injectors can also contribute to engine noise. Additionally, ensure that all belts and pulleys are secure; loose components can create unwanted sounds. Don't overlook the exhaust system, as leaks can produce ticking noises that may be mistaken for engine issues. Finally, consider the timing chain, as problems here can lead to significant engine noise and require professional assessment. By following this diagnostic approach, you can effectively identify and address the source of the ticking noise, ensuring your vehicle runs smoothly.

What are the common causes of a ticking noise in the engine of a 2017 Mercedes-Benz S550e?

When diagnosing a ticking noise in the engine of a 2017 Mercedes-Benz S550e, it's crucial to consider several common problems that could be at play. One of the primary culprits is valve train issues, which may arise from worn lifters or valves, leading to an audible ticking sound. Additionally, low engine oil levels or dirty oil can exacerbate this issue, as insufficient lubrication causes engine components to rub against each other, resulting in noise. Another potential source of the ticking could be a faulty timing chain tensioner, which may fail to maintain proper tension on the timing chain, creating a ticking sound as it operates. An exhaust leak is also a possibility; when hot gases escape through small openings in the exhaust system, they can produce a distinct ticking or tapping noise. Lastly, a malfunctioning fuel injector can contribute to the ticking sound, as it operates within the engine. Addressing these issues promptly is essential to prevent further damage, and if you're uncertain about the source of the noise, consulting a professional mechanic for a thorough inspection is advisable.

How urgent is it to address the ticking noise in the engine of a 2017 Mercedes-Benz S550e?

Addressing the ticking noise in the engine of a 2017 Mercedes-Benz S550e is a matter of urgency that should not be overlooked. Early detection is crucial, as ignoring this symptom can lead to more severe engine problems, including potential failure of critical components. The ticking could stem from low oil levels, worn-out parts, or valve train issues, all of which can escalate if not promptly addressed. The risk of neglecting such noises not only jeopardizes the engine's performance and longevity but also poses safety concerns for the driver and passengers. Therefore, it is highly advisable to seek a professional inspection to accurately diagnose the issue and implement necessary repairs. By taking swift action, you can safeguard your vehicle's health and ensure a safer driving experience.

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