Full text: What engine noises should you never ignore?

At Mario Garage in Cagnes-sur-Mer, we often hear the same question from BMW, Mercedes, and Audi owners: “I hear a strange noise coming from the engine — what could it be?” At first, the noise might seem harmless, but it often signals a serious issue.

We always tell our clients: an engine never makes unusual noises for no reason. The sooner you identify the cause, the easier and less expensive the repair will be.

What you need to know first

A modern car engine is a complex system, and any unusual noise is a sign that something isn’t working properly.
A hum, knock, or whistle can indicate significant wear. Only a proper diagnostic can pinpoint the exact source of the noise.

Which noises are especially dangerous?

Based on our experience, especially with German vehicles, here are the top 5 engine noises you should never ignore:

• Metallic knocking sound at startup
  Could indicate issues with hydraulic lifters or pistons.

• Whistling or squealing while accelerating
  Often caused by a worn timing belt or tensioner pulleys.

• Popping sounds from the exhaust
  May point to ignition problems or incorrect fuel supply.

• Humming noise that gets louder with RPMs
  Can signal worn bearings or gearbox issues.

• Vibrations or rattling at idle
  Might be due to faulty engine mounts or air intake problems.

Even if the noise comes and goes, don’t delay a visit to the garage. It could lead to a major breakdown.

Why choose us?

At Mario Garage, we use professional diagnostic equipment designed for premium brands like BMW, Mercedes, Audi, and Volkswagen.
We don’t just locate the noise — we analyse the entire engine to eliminate the root cause and prevent further damage.

Can you keep driving with engine noises?

Sometimes — yes, but it’s risky. We’ve seen many cases where drivers kept going and ended up needing expensive repairs: broken timing chains, damaged pistons, or even complete engine rebuilds.

When should you book a diagnostic?

• If the noise is getting louder over time

• If you hear metallic knocking or grinding sounds

• If the engine runs unevenly

• If fuel consumption has increased

Come to Mario Garage in Cagnes-sur-Mer — we’ll perform a complete diagnostic and eliminate the source of the noise so your engine runs smoothly and reliably again.

These may point to valve issues, turbo problems, or low oil.
Get your engine diagnosed at Mario Garage https://mariogarage.fr/en/diagnostic-moteur

Book your maintenance service now!

Address 105 Chemin du Val de Cagnes 06800 Cagnes-sur-Mer

Phone +33 628 766 484

WhatsApp +33 628 766 484

Opening hours Mon-Fri, 09:00-18:00