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Vibrations at idle on my 2020 E350 - Engine mounts?

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Rachel A. · rep 0 · May 22, 4:19 AM · 1 replies · solved · Question

Vehicle: 2020 Mercedes-Benz E350

Hello ClearTheCode community,

I've been noticing some unusual vibrations in my 2020 Mercedes-Benz E350 (W213 chassis) lately, especially when the car is idling in drive or reverse. It's not constant, but definitely more pronounced than it used to be. I can feel it through the steering wheel and the seat.

The car has about 45,000 miles on it. Could this be a sign of failing engine mounts? I haven't hit any major potholes or had any accidents. What are the typical symptoms of bad engine mounts on these cars, and is it a common issue at this mileage?

Thanks for any insights!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:19 AM

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Hi Sarah,

Your description of vibrations at idle, felt through the steering wheel and seat, is a classic symptom of failing engine mounts on a Mercedes-Benz E350. While 45,000 miles might seem a bit early, it's not unheard of, especially with certain driving conditions or if the car frequently idles for extended periods.

Understanding Engine Mounts: Engine mounts (or motor mounts) are designed to support the engine and transmission, isolating vibrations and noise from the chassis. Modern Mercedes-Benz vehicles often use hydraulic or active (electronically controlled) engine mounts for superior comfort. Over time, the rubber components can degrade, or the hydraulic fluid can leak out, reducing their effectiveness.

Common Symptoms of Failing Engine Mounts:

  • Increased Vibrations: Most noticeable at idle, in drive or reverse, and sometimes under light acceleration.
  • Clunking or Thumping Noises: Especially when shifting into gear, accelerating hard, or going over bumps.
  • Engine Movement: You might observe excessive engine movement when revving the engine while the hood is open (with the car in park and brake applied).

Diagnosis and Repair:

  1. Visual Inspection: A mechanic can visually inspect the mounts for cracks, leaks (if hydraulic), or excessive sagging.
  2. Load Test: Applying slight load to the engine (e.g., holding the brake while in drive) can sometimes reveal movement or noise.
  3. Replacement: If confirmed, both engine mounts (and often the transmission mount) are typically replaced simultaneously to ensure balanced support and prevent premature failure of the new mounts. This is a job best left to a professional due to the need to support the engine safely.

When to See a Shop:

  • Immediately if you suspect failing engine mounts. While not an emergency, prolonged driving with bad mounts can put stress on other components (exhaust, driveshaft, hoses) and significantly degrade your driving experience.
  • There are no specific OBD-II codes for failing engine mounts unless an active mount system develops an electrical fault, which would trigger a 'Check Engine' light and a specific code related to the mount's sensor or actuator (e.g., P0Axx or manufacturer-specific codes).

Addressing this issue promptly will restore your E350's smooth ride and prevent potential secondary problems.

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