Mercedes-Benz CLA35 AMG Engine Makes A Ticking Noise

Common Causes of Ticking Noises in Your Mercedes-Benz CLA35 AMG Engine and How to Address Them

Find Repair Location
Reviewed by
Devin Cabugcal
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 Mercedes-Benz CLA35 AMG 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 Mercedes-Benz CLA35 AMG 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.

Troubleshooting Ticking Noise in a Mercedes-Benz CLA35 AMG

When troubleshooting a ticking noise in your Mercedes-Benz CLA35 AMG, start by inspecting the engine bay for any visible dirt or debris, particularly around the crankshaft pulley, as this is a common culprit for such sounds. Ensure that the engine is off and cool before you begin your inspection. Next, check the oil level and condition; low or dirty oil can lead to lubrication issues, causing excessive friction and resulting in ticking noises. If the oil appears contaminated, consider an oil change and use a high-quality oil filter. If the noise persists, focus on the timing chain and valve train components. Listen carefully to pinpoint the source of the noise; if it seems to emanate from the valve covers, it may indicate valve train clatter. Additionally, inspect the cam oilers for any signs of damage or blockage, as these can also contribute to ticking sounds. If these initial checks do not resolve the issue, it may be time to consult a professional mechanic for a more thorough diagnosis, especially if you suspect timing chain problems, which can significantly affect your vehicle's performance and safety.

What Could Cause a Ticking Noise in the Engine of a Mercedes-Benz CLA35 AMG?

When you hear a ticking noise in the engine of your Mercedes-Benz CLA35 AMG, it’s crucial to identify the underlying cause to prevent further damage. One common issue is the buildup of dirt and debris in the crankshaft pulley, which can create a ticking sound as it rotates. Additionally, lubrication problems can lead to excessive friction among moving parts, resulting in similar noises. It's essential to check your engine oil level and pressure, as low oil can significantly impact engine performance and lead to ticking sounds. Another critical area to inspect is the timing chain and tensioner; problems here can produce a distinct rattling noise that, if neglected, may result in severe engine failure. Lastly, ensure that your oil maintenance is up to date, as dirty or insufficient oil can exacerbate engine noise. By addressing these potential issues promptly, you can maintain the health of your engine and enjoy a smoother driving experience.

Why is My Mercedes-Benz CLA35 AMG Engine Making a Ticking Noise?

When your Mercedes-Benz CLA35 AMG engine starts making a ticking noise, it’s crucial to understand that this sound is not just an annoyance; it can signal underlying problems that may escalate if left unaddressed. Common culprits include dirt accumulation in the crankshaft pulley, which can create friction and lead to further engine wear. Additionally, insufficient lubrication can cause excessive friction among moving parts, potentially resulting in severe engine damage. Ignoring these symptoms can compromise your vehicle's performance and safety, making it imperative to act swiftly. If you’re considering a DIY approach, start by checking the oil levels and ensuring proper lubrication, as well as inspecting the crankshaft pulley for debris. However, if the noise persists, it’s advisable to consult a qualified mechanic to accurately diagnose and resolve the issue before it leads to more significant repairs or safety hazards.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.