Top 5 Mercedes Problems & Repairs

By May 19, 2017Mercedes-Benz

At JL Motorworks, we specialize in Mercedes-Benz. We love these cars for their luxury, performance, and longevity. But as always, machines eventually wear down after years of faithful service, and parts need to be maintained, repaired, and replaced in order to function properly. Mercedes owners out there: stay on top of regular maintenance and inspections, and choose a mechanic who (like us) specializes in Mercedes.

Now, here are the top five potential problems to look out for with your Mercedes-Benz. (Consider these also if you’re looking to buy a used Mercedes-Benz.)

Top 5 Mercedes Problems & Repairs

1. Rust

Rust results when the metal on your car mixes with oxygen or water. For whatever reason, many Mercedes models seem to be prone to rust issues. Obviously, rust is an eyesore. But it can be worse than just aesthetics — rust can also impact the car’s durability, reliability, and longevity.

Small surface rust spots (sometimes called “cosmetic rust”) aren’t usually a big deal as they are localized to one small area. They may weaken the paint around the spots, but won’t affect the car’s performance. These spots can also be repaired.

Larger rust spots, on the other hand, can be more pervasive and affect the integrity of the vehicle. If you see any of the following rust issues, it could indicate a serious problem:

  • corrosion on the seams of body panels such as the inside bottom of the door or along the fenders
  • areas where the metal is completely rusted through
  • corrosion on thinner parts of the car — may have caused a hole in the body
  • large areas of corrosion around the spot welds on the floor of the vehicle
  • frame rust — can cause parts to snap off or crack, making the car unsafe to drive
  • rusty brake lines and gas lines

All of these indicate more serious (and costly) problems and can affect the car’s safety and integrity. (source:

2. Engine Mounts

Engine mounts secure the engine and transmission to the frame of the car and also absorb road shock and reduce engine noise and vibrations. Because engine mounts are under stress all the time, it makes sense that they would eventually wear down in high-mileage vehicles. With Mercedes, this usually happens around the 100,000 mile mark.

The engine harness can also fail in Mercedes-Benz models. The engine harness is an assembly of wires that transmit power to your car’s engine and battery. Over time, heat from the engine can cause the wire covering to crack, causing wires to short together or to the body of the vehicle.

3. Window Regulators

Audis and BMWs have this problem as well. With Mercedes, windows tend to fail more on ML-Class and C-Class. Regulator chips can break, causing slow moving or immovable power windows. The regulator chip will need to be replaced.

Top 5 Mercedes Problems & Repairs4. Airmatic Suspension

The first Mercedes models that had air suspension were the S-Class W220 in 2000, and later the E-Class W211. The Airmatic bags replace the struts and shocks on many, but not all, Mercedes-Benz models. It seems the air suspension components most prone to failure are the suspension air compressor and relay, and the air suspension strut/bag.

5. Transmission

The five-speed automatic transmission can sometimes go into “limp mode”, and shifting is erratic or altogether stuck. According to,

You would be surprised to know that the majority of the transmissions problems such as hard shifting and no shifting issues come from incorrect transmission fluid level or the infamous transmission 13 pin connector plug O-ring. These are easy fixes that you can even tackle yourself.

If you’re experiencing problems with your Mercedes-Benz, call JL Motorworks for a quick and accurate diagnosis and fast repair turnaround time!

Top 5 Mercedes Problems & Repairs | JL Motorworks