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  3. MERCEDES 155-078-00-49

MERCEDES 155-078-00-49 Fuel Injector Benz

fits make: Mercedes. year: 2005–2009.

155-078-00-49 Mercedes-benz Genuine Fuel Injector

( Manufacturer Part Number: 155-078-00-49 ), ( Part Type: Fuel Injector ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Make: Mercedes-benz ), ( Year: 2005 2006 2007 2008 2009 )

Review MERCEDES benz Genuine Fuel Injector fits 2005–2009

The **Mercedes-Benz 155-078-00-49 fuel injector** is a high-performance, precision-engineered component designed exclusively for select models within the Mercedes-Benz lineup, specifically tailored to meet the stringent demands of modern diesel engines. This injector is a critical part of the common-rail direct injection system, responsible for delivering an exact metered dose of ultra-fine fuel directly into the combustion chamber under extremely high pressures typically ranging between 20,000 and 22,000 psi (1,400 to 1,550 bar). Crafted from high-grade stainless steel and advanced materials, the injector features a robust, needle-valve mechanism that ensures optimal atomization of fuel, enhancing combustion efficiency and reducing emissions. Its sleek, compact design integrates seamlessly with the engine s fuel rail system, allowing for precise control over fuel delivery cycles, which is essential for maintaining power output, torque, and fuel economy across a wide operational range. The 155-078-00-49 is engineered with Mercedes-Benz s proprietary solenoid technology, ensuring rapid and repeatable actuation with minimal wear, even under the most demanding driving conditions. This injector is compatible with Mercedes-Benz models equipped with OM646, OM651, OM654, and OM656 diesel engines, including popular vehicles such as the E-Class (W212/W213), GLK-Class (X204), and the S-Class (W222/W221), making it a vital replacement part for maintaining peak performance in these sophisticated powertrains. Built to withstand the thermal and mechanical stresses of continuous operation, the injector is also designed for easy installation and compatibility with modern diagnostic tools, allowing for straightforward integration into repair or upgrade procedures. Whether used as an OEM replacement or as part of a performance enhancement package, the 155-078-00-49 fuel injector exemplifies Mercedes-Benz s commitment to precision engineering, reliability, and cutting-edge automotive technology.

**Pros and Cons of buying a Mercedes-Benz 155-078-00-49 Fuel Injector**

The **Mercedes-Benz 155-078-00-49** is a fuel injector used primarily in diesel engines, particularly in models like the **OM617, OM646, and OM654** (common in vehicles such as the **E220 CDI, E260 CDI, and GLK 220 CDI**). Below is a detailed analysis of its advantages and disadvantages.

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### **Pros**

1. **OEM Quality and Reliability**

- This is a genuine Mercedes-Benz part, meaning it meets the manufacturer s exact specifications for performance, durability, and compatibility. OEM components are designed to match the engine s original design, reducing the risk of premature failure or poor fitment.

2. **Long-Term Durability**

- Mercedes-Benz fuel injectors are built to last the lifespan of the engine with proper maintenance. The **155-078-00-49** is no exception, often outperforming aftermarket alternatives in terms of longevity, especially in high-mileage or performance-oriented applications.

3. **Precision Engineering**

- The injector is designed with tight tolerances to ensure optimal fuel atomization and combustion efficiency. This contributes to better fuel economy, smoother engine operation, and reduced emissions compared to lower-quality injectors.

4. **Warranty Coverage**

- Purchasing from an authorized Mercedes-Benz dealer or a reputable supplier often includes a warranty (typically 1 2 years). This provides peace of mind against defects in materials or workmanship.

5. **Compatibility with Upgrades**

- If you plan to modify your engine (e.g., turbo upgrades, remapping, or high-flow fuel systems), an OEM injector like this one is more likely to handle increased demands without failing prematurely.

6. **Resale Value Protection**

- Keeping your vehicle stock or using OEM parts helps maintain its resale value. Dealers and buyers often prefer vehicles with original components, especially in luxury or high-demand models.

7. **Easier Diagnostics and Repairs**

- Since it s an OEM part, mechanics familiar with Mercedes-Benz systems will have experience working with it. This can simplify troubleshooting and repair processes compared to aftermarket injectors that may require additional calibration or adjustments.

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### **Cons**

1. **High Cost**

- The **155-078-00-49** is significantly more expensive than aftermarket alternatives. Prices typically range from **$300 to $600 per injector**, depending on the supplier. For multi-injector engines (e.g., V6 or V8), the total cost can be prohibitive for budget-conscious buyers.

2. **Limited Availability Outside Dealerships**

- While OEM parts are widely available, finding them outside authorized dealerships or specialty Mercedes-Benz suppliers can be challenging. Some online marketplaces or used part sellers may offer counterfeit or refurbished injectors that don t meet OEM standards.

3. **Longer Lead Times**

- Unlike aftermarket parts, which can often be shipped within days, OEM injectors may take **weeks** to arrive, especially if ordered directly from Mercedes-Benz. This delay can be inconvenient if you re working on a project with tight deadlines.

4. **Potential for Overkill**

- If your engine has minimal issues (e.g., minor clogging or wear), replacing all injectors with new OEM units may be unnecessary. In such cases, cleaning or repairing existing injectors (via services like **Gulf or Wynn s**) could be a more cost-effective solution.

5. **Risk of Counterfeit Parts**

- The high demand for Mercedes-Benz parts makes them a target for counterfeiters. Purchasing from untrusted sellers (e.g., unknown eBay vendors or unlicensed online stores) increases the risk of receiving fake or low-quality injectors that fail quickly.

6. **Maintenance Requirements**

- While durable, OEM injectors still require proper maintenance (e.g., regular fuel system cleaning, high-quality fuel, and timely servicing) to prevent issues like carbon buildup or internal wear. Neglecting maintenance can void warranties and reduce lifespan.

7. **No Performance Advantage Over Clean Injectors**

- If your existing injectors are functioning but slightly dirty or worn, replacing them with new OEM units won t provide a noticeable performance boost. The gains in fuel economy or power will be marginal unless the injectors were failing outright.

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### **Conclusion**

The **Mercedes-Benz 155-078-00-49 fuel injector** is a high-quality, reliable component that justifies its cost if you prioritize **long-term durability, OEM compatibility, and warranty protection**. It is ideal for:

- **Restoring or maintaining a high-mileage Mercedes-Benz diesel engine** to factory specifications.

- **Vehicles where resale value or originality is important** (e.g., classic or luxury models).

- **Owners planning future modifications** that may stress the fuel system.

However, if you re working with a **tight budget** or only need to address **minor injector issues**, aftermarket alternatives (e.g., **Bosch, Delphi, or Stanadyne injectors**) or **injector cleaning services** may be more practical. Additionally, if you re unable to source the part quickly or verify its authenticity, the convenience and cost savings of aftermarket options could outweigh the benefits.

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### **Recommendation**

1. **Buy from an Authorized Source**

- Purchase the **155-078-00-49** from a **Mercedes-Benz dealership, MB Parts Store, or a trusted online supplier** (e.g., **MBPartStore, MBBatteries, or RockAuto**) to ensure authenticity and warranty coverage.

2. **Compare with Aftermarket Options**

- If cost is a concern, research **high-quality aftermarket injectors** (e.g., **Bosch 0 220 155 078** or **Delphi DFI-155-078**) that are compatible with your engine. These can cost **30 50% less** while still offering good performance.

3. **Assess Your Engine s Condition**

- If your injectors are **not failing but just dirty**, consider **professional cleaning** (e.g., **Gulf Diesel Injector Cleaner or Wynn s**) before replacing them. This can save hundreds of dollars.

4. **Consider a Bundle or Refurbished Option**

- Some suppliers offer **refurbished OEM injectors** at a discount, though these may come with shorter warranties. If you re comfortable with this trade-off, it can be a cost-effective middle ground.

5. **Plan for Future Maintenance**

- If you invest in OEM injectors, ensure you re using **high-quality fuel additives** (e.g., **Liqui Moly Jectron, Sta-Bil Diesel, or MB-approved fuel treatments**) to extend their lifespan.

**Final Verdict:**

For **long-term reliability and peace of mind**, the **155-078-00-49 OEM injector** is the best choice, especially if you re committed to maintaining your Mercedes-Benz at factory standards. However, if budget constraints or minor issues are the primary concern, weigh the costs and benefits of aftermarket parts or cleaning services before proceeding. Always prioritize **authenticity and compatibility** to avoid costly mistakes.

Details:

Parts must be resalable and in the original packaging. Genuine Mercedes-Benz Fuel Injector 155-078-00-49: Parts: Incl.Seals. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Electrical parts are not returnable.

part #: 1550780049 price

  • $141.25

specifications carfuelinjector:

  • for makes: Mercedes
  • for years: 2005-2009
  • mpn: 155-078-00-49
  • part type: Fuel Injector
  • genuine oem: Yes
  • manufacturer warranty: 1 Year
  • fitment type: Direct Replacement
  • make: Mercedes-benz
  • year: 2005 2006 2007 2008 2009

seller carfuelinjector:

  • rating: 100.0%
  • # reviews: 333
  • city: Medford, Oregon

returns carfuelinjector:

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

offer carfuelinjector:

  • options: Ship-to-home
  • quantity: 2
  • sold: 0
  • started: February 7, 2026
  • availability: In Stock

general carfuelinjector:

  • Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
  • condition: New

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for makes: mercedes, for years: 2005-2009, part type: fuel injector, genuine oem: yes, manufacturer warranty: 1 year, fitment type: direct replacement, year: 2005 2006 2007 2008 2009,
manufacturer: mercedes-benz, category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 14576295220702722,
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