MERCEDES 172-520-21-23-64 Noise Benz

( Genuine Oem: Yes ), ( Oem Part Number: 172-520-21-23-64 ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Parts Included: Only Part Reference 10 On The Diagram Is Included ), ( Replaces Part Number: 1725200723, 1725202123 ), ( UPC: 172520212364 )

Review MERCEDES benz Genuine Noise Capsule

The **Mercedes-Benz 172-520-21-23-64 noise** refers to a specific diagnostic trouble code (DTC) associated with the engine control system of certain Mercedes-Benz vehicles, particularly those equipped with the **OM646** or **OM647** inline-six diesel engines, commonly found in models like the **E220 CDI (W211)**, **E220 CDI (W212)**, and **E220 CDI (W204)** from the early to mid-2000s. This code is part of the vehicle s on-board diagnostics (OBD-II) system and indicates an issue related to the **engine s noise detection mechanism**, specifically a fault in the **noise sensor (Schalldrucksensor)**, which monitors the acoustic emissions from the engine to help the ECU (Engine Control Unit) assess the condition of critical components such as the **turbocharger, exhaust manifold, or cylinder head gasket integrity**. The noise sensor, typically located near the exhaust manifold or intake manifold, detects vibrations and pressure waves generated by the engine and transmits this data to the ECU to detect potential mechanical wear, leaks, or malfunctions that could lead to catastrophic failure if left unaddressed. When this sensor fails or provides erroneous readings, the ECU triggers the **172-520-21-23-64 noise code**, often accompanied by symptoms such as **unexpected engine noise, reduced power, a check engine light, or even a sudden loss of turbo boost pressure**, as the ECU may misinterpret normal engine sounds as signs of trouble, leading to incorrect fuel injection or timing adjustments. Diagnosing this issue requires specialized diagnostic tools, such as a **Mercedes-Benz STAR or DAS scanner**, to retrieve the full fault code and perform a **live data stream analysis** to confirm whether the noise sensor itself is faulty or if the issue stems from a mechanical problem (e.g., a failing turbocharger or cracked exhaust manifold) that the sensor is incorrectly flagging. Replacement of the noise sensor alone may not resolve the underlying problem, as the root cause such as a turbocharger bearing wear or a cracked cylinder head must be addressed to prevent recurring issues. This code is particularly critical in diesel engines, where precise monitoring of turbocharger health is essential for maintaining efficiency, emissions compliance, and long-term engine reliability. Proper diagnosis and repair are vital to avoid costly engine damage and ensure the vehicle operates at optimal performance.

### **Analysis of Buying a Mercedes-Benz 172-520-21-23-64 (W202 E-Class, 2002 2005, 2.2L Diesel, 170 HP)**

This vehicle identification number (VIN) corresponds to a **Mercedes-Benz W202 E-Class (E220 CDI)**, a mid-cycle facelift model produced between **2002 and 2005**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Reliability of the 2.2L OM611 Diesel Engine**

- The **OM611** (OM611.960 for this model) is a robust diesel engine known for longevity when properly maintained. With **170 HP and 300 lb-ft of torque**, it provides strong performance for highway driving and towing (up to 3,500 lbs with proper setup).

- Many examples with **under 150,000 miles** retain good health if serviced regularly (oil changes, fuel system maintenance, and timing belt replacement if due).

2. **Comfort and Refinement**

- The W202 E-Class is renowned for its **luxury interior**, quiet cabin, and smooth ride, especially on highways. The **adjustable seats, power windows, and climate control** make it a comfortable daily driver.

- **Air suspension (optional)** enhances ride quality, though it can be expensive to repair if failed.

3. **Fuel Efficiency**

- The **2.2L diesel** offers ** 25 30 MPG highway**, significantly better than gasoline alternatives of the era. This makes it cost-effective for long-distance driving.

- Diesel fuel was (and still is in some regions) cheaper than gasoline, further improving economics.

4. **Resale Value and Prestige**

- Mercedes-Benz retains strong **resale value** for well-maintained examples, especially in the **E-Class diesel** segment.

- The brand carries **prestige**, which can be appealing for buyers who value luxury and status.

5. **Availability of Parts and Service**

- As a **common model**, parts (especially for the diesel engine) are widely available, though some aftermarket components may be required for older examples.

- **Mercedes-Benz dealerships** and independent specialists still service W202 models, though labor costs can be high.

6. **Safety Features**

- Equipped with **standard ABS, EBD, and airbags**, along with **stability control (optional)**, it meets modern safety standards for its era.

- **Side-impact airbags** were standard in later 2002 2005 models.

7. **Potential for Modifications**

- The **OM611** can be tuned for **additional power** (e.g., ** 200 250 HP** with a turbo upgrade or fuel system modification), though this requires expertise.

- **Exhaust, suspension, and interior upgrades** are popular among enthusiasts.

---

### **Cons**

1. **Common Diesel-Specific Issues**

- **Fuel Injectors**: The **OM611** is prone to **carbon buildup and injector failure** if not maintained with **high-quality diesel fuel and injector cleaning** (every 30,000 50,000 miles).

- **Turbocharger Failure**: The **turbocharger** can wear out around **100,000 150,000 miles**, leading to **loss of power and excessive smoke**. Replacement is costly ( $1,500 $2,500).

- **DPF (Diesel Particulate Filter)**: Later models (2004 ) may have **DPF issues** if driven short distances frequently, clogging the filter and requiring regeneration or replacement ( $1,000 $2,000).

2. **Electrical and Computer Problems**

- **Faulty sensors** (e.g., **MAF, crankshaft position sensor**) causing **check engine lights**.

- **Infotainment system glitches** (especially in older models).

- **Window regulators** failing (common in high-mileage examples).

- **Diagnostic trouble codes (DTCs)** can be frequent, requiring **OBD-II scanning and repairs**.

3. **Transmission Issues**

- The **5-speed automatic (5G-Tronic)** is generally reliable but can develop **slippage or rough shifting** over time.

- **Manual transmission (optional)** is more durable but less common in this model.

4. **High Maintenance Costs**

- **Mercedes-Benz dealership labor rates** are among the highest in the industry ( $120 $150/hour).

- **Specialist diesel mechanics** may be needed for complex repairs (e.g., **common rail fuel system, turbocharger**).

- **Timing belt replacement** (if due) is critical **failure can destroy the engine** ( $1,500 $2,500).

5. **Rust and Body Issues**

- **Underbody rust** is common in **salted climates** (e.g., northern U.S., Canada). Check for **corrosion on the subframe, exhaust, and wheel wells**.

- **Sunroof leaks** are a frequent complaint, leading to **headliner damage and electrical shorts**.

6. **Depreciation and Market Saturation**

- While diesel E-Classes hold value better than gasoline models, **supply is high**, meaning **prices are competitive but not premium**.

- **Used diesel Mercedes parts** can be expensive due to demand.

7. **Emissions and Compliance (U.S. Market)**

- Some **2002 2004 models** may not meet **current emissions standards** in the U.S., requiring **smog checks or modifications** in certain states.

- **California s stricter regulations** may limit where the vehicle can be driven.

8. **Comfort Wear (High Mileage Examples)**

- **Seats** can become **stiff or cracked** after **150,000 miles**.

- **Steering wheel and shift knob** may wear out, requiring replacement.

- **Interior plastics** can yellow or crack over time.

---

### **Conclusion**

The **Mercedes-Benz W202 E220 CDI (172-520-21-23-64)** is a **capable, comfortable, and fuel-efficient** luxury sedan with a **reliable diesel engine** when properly maintained. It excels in **long-distance driving, towing, and daily comfort**, making it a strong choice for buyers who prioritize **luxury, durability, and efficiency**.

- **Higher maintenance costs** (especially for diesel-specific issues).

- **Electrical and sensor problems** that require diagnostic work.

- **Rust and body wear** in older examples.

- **The need for regular upkeep** (fuel system cleaning, turbo monitoring, etc.).

**Buyers with mechanical experience** (or access to a trusted Mercedes specialist).

**Those who drive it frequently** (diesel engines hate sitting idle).

**People who prioritize comfort and prestige** over ultra-low maintenance.

**Owners in regions with low salt exposure** (to minimize rust concerns).

You **cannot afford unexpected repairs** (e.g., turbo, injectors, electrical).

You **drive short distances** (DPF issues may arise).

You **prefer plug-and-play reliability** (this is a **luxury car, not a daily driver for the frugal**).

---

### **Recommendation**

- You find a **well-documented example with under 150,000 miles**, **full service records**, and **no major diesel issues**.

- You are prepared for **higher maintenance costs** and **potential electrical quirks**.

- **Smooth turbo response** (no excessive lag or smoke).

- **No check engine lights** (or resolved codes).

- **No leaks** (oil, coolant, fuel).

- **Functioning electrical components** (windows, lights, infotainment).

- **No rust** in critical areas (subframe, exhaust, wheel wells).

- **Get a pre-purchase inspection (PPI) from a Mercedes specialist** ( $200 $300).

- **Verify fuel system health** (injector cleaning, turbo condition).

- **Check for rust** (especially in snowy regions).

- **Negotiate price based on mileage and condition** (aim for **$8,000 $12,000** for a solid example in the U.S.).

- If **maintenance costs are a concern**, consider a **later W203 E-Class (2005 201

Details:

Electrical parts are not returnable. Attention to Detail: Precision is vital when it comes automotive parts. They should be able to accurately identify and source the right parts for specific vehicle model's. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

Staff should pay attention to detail ensure that the right parts are ordered and they meet necessary quality standard's. A good parts team should have the ability to communicate effectively with service technicians ensure correct are ordered and installed. Parts must be resalable and in the original packaging. Continuous Improvement: A great parts department is always looking for ways to improve its services.

part #: 172520212364 prices

• $225.00-$295.76

specifications ocoosys:

• for makes: Mercedes
• genuine oem: Yes
• oem part number: 172-520-21-23-64
• manufacturer warranty: 1 Year
• universal fitment: Direct Replacement
• parts included: Only Part Reference 10 On The Diagram Is Included
• replaces part number: 1725200723, 1725202123
• upc: 172520212364

seller ocoosys:

• # reviews: 659
• city: Covington, Louisiana
• rating: 99.1%

returns ocoosys:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer ocoosys:

• availability: In Stock
• quantity: 3
• options: Ship-to-home
• sold: 0
• started: May 1, 2026

payments ocoosys:

• other
• wallet: Google-pay
• credit card: Mastercard

general ocoosys:

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

shipping ocoosys:

• transit: 5-11 Days
• type: Fixed
• class: Standard
• service: Standard
• cost: $36.83

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