MERCEDES 400105 Zv Actuator Rear Left Benz

( Manufacturer Part Number: 400105 ), ( Remote Controls: Central Locking System ), ( Type: Door Lock ), ( Universal Fitment: No ), ( Vintage Part: Yes ), ( Placement On Vehicle: Rear, Left )

Review MERCEDES benz Zv Actuator Rear Left Used fits W124

The **Mercedes-Benz 400105 W124 ZV Actuator (Rear Left)** is a precision-engineered component integral to the smooth and reliable operation of the iconic W124 generation sedans, coupes, and station wagons produced between 1991 and 2005. This actuator, part of the vehicle s sophisticated **ZV (Zentralverriegelung) central locking system**, is responsible for remotely controlling the locking and unlocking mechanism of the rear left door, ensuring convenience, security, and seamless integration with the driver s key fob or interior controls. Crafted to Mercedes-Benz s exacting standards, this actuator is built with a robust **plastic housing** reinforced with metal components to withstand the rigors of daily use, including exposure to varying temperatures, moisture, and mechanical stress. Inside, a **high-torque electric motor** drives a precision gear system, delivering smooth and silent operation even after prolonged use. The actuator s design incorporates a **flexible cable or linkage mechanism** that translates the motor s rotational force into linear motion, precisely engaging or disengaging the door latch with minimal play, thereby preventing premature wear and ensuring a consistent, secure seal. Compatible with a wide range of W124 models including the **E-Class (S202), C-Class (W202), and SL-Class (R230)** this part is often sought after by enthusiasts and mechanics for its critical role in maintaining the vehicle s original functionality, especially in cases where the original actuator has failed due to electrical issues, mechanical fatigue, or corrosion. Whether replacing a worn-out unit or upgrading an aftermarket system, this actuator exemplifies Mercedes-Benz s commitment to precision engineering, offering a durable, long-lasting solution that aligns with the brand s reputation for luxury and performance. Proper installation requires careful attention to wiring connections, linkage alignment, and calibration with the vehicle s central locking system to ensure flawless operation.

**Analysis of Buying a Mercedes-Benz W124 ZV Actuator (Part Number: 400105) Rear Left**

### **Pros**

1. **Direct OEM Replacement** This is an original equipment manufacturer (OEM) part, meaning it is designed to fit perfectly with the W124 model s electrical and mechanical systems. It ensures compatibility with the vehicle s existing wiring, connectors, and mounting points.

2. **Reliability and Durability** Mercedes-Benz parts are engineered to meet strict quality standards, reducing the risk of premature failure compared to aftermarket alternatives. The ZV actuator (a component of the power window system) is a critical part, and an OEM unit minimizes the chance of electrical or mechanical issues.

3. **Warranty Coverage** If purchased from an authorized dealer or a reputable supplier, this part may come with a warranty, providing peace of mind against defects. Some OEM parts also retain limited warranty coverage from the manufacturer.

4. **Long-Term Performance** Since the W124 is an older model (discontinued in 2001), finding a genuine replacement part can be challenging. Owning an OEM actuator reduces the risk of compatibility problems with aftermarket parts that may not function as intended.

5. **Resale Value Preservation** If you plan to keep or sell the vehicle later, using OEM parts helps maintain its original condition and appeal to buyers who prefer complete vehicles with authentic components.

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### **Cons**

1. **High Cost** OEM parts are significantly more expensive than aftermarket alternatives. The price of this actuator may be 2 3 times higher than a comparable aftermarket part, which can be a financial burden, especially if multiple components need replacement.

2. **Limited Availability** As the W124 is outdated, sourcing this specific part may require searching through specialty suppliers, eBay, or salvage yards. Lead times can be longer, and availability is not guaranteed.

3. **Potential Overkill for Minor Issues** If the actuator failure is isolated and the rest of the power window system is functional, replacing only this part may not be necessary. A thorough diagnosis by a mechanic could reveal whether other components (e.g., regulators, motors, or wiring) are also faulty, making a full system replacement more cost-effective.

4. **Installation Complexity** While the part itself is straightforward, removing the rear quarter panel or door trim to access the actuator can be labor-intensive, especially for inexperienced DIYers. Professional installation may be required, adding to the total cost.

5. **Environmental and Ethical Concerns** Purchasing a used or salvaged OEM part (e.g., from a junkyard) may raise questions about its condition, mileage, or whether it has been previously repaired. New OEM parts, while ideal, contribute to electronic waste if not used properly.

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### **Conclusion**

- You prioritize reliability, longevity, and compatibility with your vehicle.

- You have the budget to invest in a high-quality replacement part.

- You value preserving the original integrity of your car, whether for personal use or resale.

- You ve confirmed that no other components in the power window system are failing.

However, if cost is a major concern or if the actuator failure is part of a larger system issue, exploring aftermarket options (from reputable brands like Bosch or Valeo) or consulting a mechanic to assess the full scope of repairs may be more economical. Additionally, if the part is difficult to source, consider checking for used OEM parts from trusted suppliers or evaluating whether the vehicle s age justifies the repair cost.

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### **Recommendation**

1. **Verify the Need**: Before purchasing, have a mechanic diagnose the power window system to ensure the actuator is the sole issue. Replacing only this part may not solve recurring problems.

2. **Compare Sources**: Obtain quotes from multiple suppliers (authorized dealers, eBay, specialty auto parts stores) to find the best price for a new or used OEM part. If budget is tight, research high-quality aftermarket alternatives with strong warranties.

3. **Consider Installation**: If you lack experience with automotive electrical work, factor in labor costs for professional installation. Some suppliers may offer installation services.

4. **Long-Term Perspective**: Weigh the repair cost against the vehicle s overall condition, mileage, and your intended use. If the car is a daily driver with high mileage, the repair may be justified; if it s a collector or low-mileage project car, the cost-benefit ratio may not align.

5. **Documentation**: Keep receipts and warranties for the part, as they may be useful for future resale or warranty claims.

**Final Verdict**: For a W124 owner who values authenticity and reliability, the OEM actuator is the best choice despite the higher cost. For budget-conscious buyers, a well-researched aftermarket part with a warranty could be a viable alternative, provided it meets the same technical specifications. Always prioritize quality over price to avoid future complications.

Details:

Came off a 1987 Mercedes benz 300D was working when removed came.

part #: 400105 prices

• $48.99-$53.99

specifications carlockiio:

• for models: W124
• for makes: Mercedes
• mpn: 400105
• remote controls: Central Locking System
• type: Door Lock
• universal fitment: No
• vintage part: Yes
• placement on vehicle: Rear, Left

returns carlockiio:

• policy: No Returns

seller carlockiio:

• # reviews: 45
• rating: 100.0%
• city: Breckenridge, Colorado

offer carlockiio:

• quantity: 1
• availability: In Stock
• sold: 0
• started: April 5, 2026
• best offers: True
• options: Ship-to-home

payments carlockiio:

• wallet: Apple-pay
• other
• credit card: Visa

shipping carlockiio:

• type: Fixed
• cost: $6.01
• transit: 4-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• class: Standard

general carlockiio:

• Car Truck Parts Accessories > Exterior Parts Accessories > Exterior Locks Lock Hardware
• condition: Used

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