1. Engine Cooling Components Deals
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  3. MERCEDES 906-520-04-23

MERCEDES 906-520-04-23 Noise Benz

fits make: Mercedes.

906-520-04-23 Mercedes-benz Genuine Noise Capsule

( Manufacturer Part Number: 906-520-04-23 ), ( Manufacturer Warranty: 1 Year ), ( Genuine Oem: Yes ), ( Universal Fitment: Direct Replacement )

Review MERCEDES benz Genuine Noise Capsule

The **Mercedes-Benz 906-520-04-23** is a specialized, high-performance **OEM noise reduction gasket** designed exclusively for the **M117 E320 (W124) engine bay**, specifically tailored to enhance cabin quietness and minimize mechanical noise transfer in this iconic luxury sedan. Crafted from Mercedes-Benz s proprietary **high-grade elastomeric composite material**, this gasket features a **multi-layered construction** with precision-engineered contours that create an optimal seal against the **intake manifold, throttle body, and surrounding engine components**. Its **smooth, textured surface** ensures a consistent bond with the mating surfaces, preventing air and vibration leaks that often contribute to road and engine noise intrusion. The **906-520-04-23** is engineered to address the unique acoustic challenges of the W124 platform, where even minor gaps can amplify exhaust, intake, and drivetrain vibrations, detracting from the refined driving experience. This gasket is particularly critical for owners seeking to restore factory-level silence in their vehicles, as it effectively dampens **engine cover and intake manifold resonance**, reducing the characteristic hum and rattles that can develop over time due to wear or improper installation. Its **dimensionally accurate fit** ensures compatibility with the **M117 2.8L and 3.2L V6 engines**, making it a must-have upgrade for enthusiasts aiming to preserve the W124 s legendary sound insulation while maintaining structural integrity. When properly installed, this gasket not only enhances passenger comfort but also contributes to a more refined, premium driving experience, aligning with Mercedes-Benz s commitment to engineering excellence.

**Pros and Cons of Buying a Mercedes-Benz 906.520.04.23 (W220 E500/55 AMG) with Known Noise Issues**

### **Overview**

The Mercedes-Benz W220 (S-Class, 1995 2002) with the **906.520.04.23** noise code refers to a common electrical or mechanical fault, often linked to issues with the **alternator, voltage regulator, or wiring harness**. This model was equipped with the **5.0L V8 (E500) or 5.4L V8 (E55 AMG)**, known for power and luxury but prone to aging electrical and mechanical components. Below is a detailed breakdown of the pros and cons of purchasing one with this noise issue.

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### **Pros**

1. **Luxury and Prestige**

The W220 S-Class is one of Mercedes-Benz s most iconic and desirable models, offering a refined interior, premium materials, and a commanding driving position. Its reputation for luxury remains strong, making it a status symbol.

2. **Powerful Engine Options**

- The **E500 (5.0L V8)** produces **285 313 hp** (depending on year) and delivers smooth, torque-rich performance.

- The **E55 AMG (5.4L V8)** generates **381 hp**, offering exhilarating acceleration and a sportier character.

Both engines are known for their **low-end torque**, making them enjoyable to drive even in stop-and-go traffic.

3. **Reliability of Core Components**

- The **transmission (automatic 7G-Tronic or 722.6)** is robust if well-maintained.

- The **suspension (adjustable air suspension in later models)** provides a smooth ride, though it can degrade over time.

- The **chassis and body structure** are solid, with fewer rust issues compared to older Mercedes models.

4. **Aftermarket Support and Modifications**

The W220 has a **large enthusiast community**, making parts (especially for the AMG models) widely available. Tuning options (e.g., **intake manifolds, exhaust, ECU flashing**) are plentiful, allowing for performance upgrades.

5. **Resale Value (for Well-Maintained Examples)**

While not as high as newer Mercedes, a **low-mileage, well-documented W220** (especially an AMG) retains decent value, particularly in collector markets.

6. **Comfort and Technology (for Its Time)**

Features like **air suspension (in later models), cruise control, and advanced climate control** were cutting-edge in the mid-1990s. The **interior is spacious**, with high-quality leather and wood/aluminum trim.

7. **Potential for Restoration**

If the noise issue is isolated (e.g., alternator or wiring), a **restored W220** can become a highly sought-after project car, especially in classic car circles.

---

### **Cons**

1. **Electrical Noise and Reliability Issues**

- The **906.520.04.23** code is often associated with **alternator or voltage regulator problems**, leading to **intermittent electrical gremlins** (e.g., flickering lights, radio dropout, dashboard warning lights).

- **Wiring harness corrosion** (common in older Mercedes) can cause **random malfunctions**, including **starter relay failures, sensor issues, or even engine misfires**.

- **Battery drain problems** are frequent, requiring frequent **battery replacements** or **parasitic drain diagnostics**.

2. **High Maintenance Costs**

- **Alternator replacement** (a common fix for this code) can cost **$500 $1,200**, depending on labor and parts.

- **Voltage regulator issues** may require **ECU reprogramming or replacement**, adding to expenses.

- **Suspension components (shocks, struts, bushings)** wear out and are **not cheap** to replace.

- **Timing chain stretch** (on the V8 engines) can lead to **knocking noises and potential engine damage** if ignored.

3. **Engine-Specific Weaknesses**

- **5.0L V8 (E500):** Prone to **oil leaks (valve cover gasket, oil pan gasket, rear main seal)**. **Carbon buildup** can reduce efficiency over time.

- **5.4L AMG V8:** More powerful but **less refined**, with **higher oil consumption** and **potential for head gasket failure** (especially if overheated).

- **Turbocharger issues** (on later E55 AMGs) can lead to **exhaust leaks and reduced power**.

4. **Transmission Problems**

- **7G-Tronic (early models)** can develop **slippage, rough shifting, or solenoid failures**.

- **722.6 (later models)** is more reliable but still **notoriously expensive to repair** if it fails.

- **Torque converter issues** (common in high-mileage examples) can cause **jerking or failure to engage**.

5. **Rust and Body Corrosion**

- While less severe than some German rivals (e.g., BMW E38), **floor pans, rocker panels, and wheel wells** can rust, especially in **salted climates**.

- **Paint delamination** is common due to aging bodywork.

6. **Fuel Economy and Modern Standards**

- The **V8 engines are thirsty**, averaging **14 16 MPG highway** poor by today s standards.

- **Modern emissions regulations** make classic cars harder to run legally in some areas, requiring **smog checks or modifications**.

7. **Parts Availability and Lead Times**

- While parts exist, **some components (especially for AMG models) can be hard to find** and may require **long shipping times**.

- **OEM vs. aftermarket parts** is a common debate aftermarket can be cheaper but may lack durability.

8. **Driving Experience Limitations**

- **Poor visibility** (especially in AMG models with aggressive front ends).

- **Outdated safety features** (no modern airbag systems, limited stability control).

- **Noise and vibration** from aging components can make long drives uncomfortable.

---

### **Addressing the Noise Issue (906.520.04.23)**

The **906.520.04.23** code typically indicates:

- **Alternator failure** (most common cause).

- **Voltage regulator malfunction** (leading to electrical gremlins).

- **Loose or corroded wiring** (common in older Mercedes).

- **ECU or sensor issues** (less common but possible).

**Diagnosis and Fixes:** 1. **Check the Alternator:**

- **Test voltage output** (should be **13.8 14.4V** with the engine running).

- **Listen for whining or grinding** (signs of a failing bearing).

- **Replace if output is inconsistent** (cost: **$300 $1,000**).

2. **Inspect the Voltage Regulator:**

- If the alternator is new but the issue persists, the **regulator may be faulty**.

- **ECU reprogramming** (if the issue is software-related) can sometimes resolve it.

3. **Examine Wiring and Connectors:**

- **Corrosion in the wiring harness** (especially near the battery or ECU) can cause intermittent noise.

- **Clean or replace corroded connectors** (common fix for random electrical issues).

4. **Check for Parasitic Drains:**

- A **dead battery** despite a good alternator suggests a **parasitic drain** (e.g., faulty relay, shorted component).

- **Use a multimeter to test for excessive current draw** when the car is off.

5. **Review OBD Codes:**

- If the noise is **intermittent**, it may trigger **P-codes (electrical) or P0010 P0020 (timing-related)**.

- **Clear codes and monitor for recurrence** to isolate the issue.

**Prevention:**

- **Regular electrical system checks** (every 12 18 months).

- **Keep wiring clean and dry** (especially in humid climates).

- **Replace the alternator before it fails** (preventive maintenance).

---

### **Conclusion**

Buying a **Mercedes-Benz W220 (E500/55 AMG) with the 906.520.04.23 noise issue** can be a **rewarding but challenging** endeavor. The **pros luxury, power, and classic appeal are significant**, but the **cons electrical quirks, high maintenance costs, and potential reliability issues must be carefully considered**.

If you **prioritize driving enjoyment, restoration potential, or collecting**, a **well-documented W220 with a known but fixable noise issue** can be a great project. However, if you **value reliability and low ownership costs**, this may not be the best choice.

### **Recommendation**

1. **If You re

Details:

Parts must be resalable and in the original packaging. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Electrical parts are not returnable.

part #: 9065200423 prices

  • $42.56-$89.09

specifications ocoosys:

  • for makes: Mercedes
  • mpn: 906-520-04-23
  • manufacturer warranty: 1 Year
  • genuine oem: Yes
  • universal fitment: Direct Replacement

offer ocoosys:

  • options: Ship-to-home
  • sold: 0
  • availability: In Stock
  • quantity: 2
  • started: June 12, 2026

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general ocoosys:

  • condition: New
  • Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

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  • transit: 4-8 Days
  • class: Standard
  • service: Standard
  • type: Fixed
  • cost: $9.99
for makes: mercedes, manufacturer warranty: 1 year, genuine oem: yes, universal fitment: direct replacement,
category: auto parts > car truck parts accessories > engine cooling components, sku: 22258534846599604,
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