BMW Roof Motor 628.BM1321

( Part Type: Motor ), ( Conditions Options: Rear Sunroof Motor ), ( Genuine Oem: Yes ), ( Ipn: 628.bm1321 ), ( Warranty: 1 Year )

Review BMW Roof Motor fits 330E 2021

The **BMW 628.bm1321 330e 2021 Roof Motor** is a precision-engineered component designed to deliver seamless, effortless operation for the iconic **BMW 330e iPerformance** model, particularly those equipped with the **Panoramic Glass Roof** or **Sunroof** systems. This high-performance electric motor is a critical element of BMW s advanced **iDrive** and **Electronic Roof Control** systems, ensuring smooth, quiet, and reliable movement of the roof panels with minimal user effort. Crafted from durable, corrosion-resistant materials and featuring BMW s signature engineering precision, this motor is engineered to withstand the rigors of daily use while maintaining optimal performance over the vehicle s lifespan. The **bm1321** designation indicates a specific variant tailored for the **330e s** powertrain and electrical architecture, integrating seamlessly with the vehicle s **NVM (Non-Volatile Memory)** and **CAN (Controller Area Network)** communication protocols to enable precise control via the **iDrive touchscreen, voice commands, or physical roof controls**. With a robust **brushless DC motor** design, this component eliminates friction and wear associated with traditional mechanical systems, reducing maintenance requirements while enhancing durability. Whether deployed in a **hardtop panoramic roof** or a **retractable sunroof**, this motor ensures a buttery-smooth operation, free from the rattles or jams that can plague lower-quality alternatives. For enthusiasts seeking to restore or upgrade their **2021 BMW 330e s** roof mechanism, this OEM-level motor guarantees compatibility with the vehicle s factory wiring harness, actuators, and software, ensuring a perfect fit and seamless integration. Its compact yet robust construction also allows for easy installation, even in tight engine bay or trunk spaces, making it an ideal choice for both professional mechanics and DIY technicians. By maintaining the **330e s** signature blend of luxury and performance, this roof motor exemplifies BMW s commitment to integrating cutting-edge technology with timeless craftsmanship, ensuring that every drive remains as refined as the vehicle itself.

### **Pros and Cons of Buying a 2021 BMW 628i (BM1321) with a Roof Motor (330e Electric Conversion)**

#### **Pros**

1. **Performance and Driving Experience**

The 628i is based on the BMW 6 Series Gran Coupe, which offers a refined, sporty, and premium driving experience. The 3.0L twin-turbo inline-6 engine (N63) delivers strong acceleration (0-60 mph in around 5.0 seconds) and a smooth power delivery. The electric conversion (330e) further enhances efficiency while maintaining performance, making it a compelling hybrid option.

2. **Luxury and Interior Quality**

The BMW 6 Series is renowned for its high-end interior, featuring premium materials (Nappa leather, aluminum trim, ambient lighting), advanced infotainment (iDrive 8.0 with touchscreen and voice control), and ergonomic seating. The spacious cabin and Gran Coupe body style provide a more practical alternative to the coupe, with a slightly longer wheelbase than the 640i.

3. **Hybrid Efficiency (330e Conversion)**

The 330e electric conversion (aftermarket) replaces the internal combustion engine with an electric motor, significantly improving fuel economy (estimated 100 MPGe) and reducing emissions. This makes it an attractive option for those seeking a high-performance electric vehicle without the high cost of a factory plug-in hybrid like the 640e.

4. **Aftermarket Customization Potential**

The 6 Series has a strong aftermarket following, allowing for modifications like performance tuning, aesthetic upgrades, and even full electric conversions (as in the 330e case). The roof motor setup (likely a conversion kit) can be tailored to individual preferences, including battery placement and charging infrastructure.

5. **Resale Value and Brand Prestige**

BMW retains strong resale value, and the 6 Series is a desirable model. Owning a BMW carries prestige, and the 628i s balance of luxury and performance ensures it remains appealing to buyers.

6. **All-Wheel Drive (xDrive) Option**

The 628i is available with BMW s xDrive all-wheel-drive system, improving traction and handling in various conditions, which is particularly useful for those who drive in snowy or wet climates.

7. **Tech and Safety Features**

The 628i comes equipped with advanced safety tech like BMW s standard driver assistance systems (adaptive cruise control, lane-keeping assist, blind-spot monitoring, and automatic emergency braking). The infotainment system is highly intuitive, with wireless Apple CarPlay and Android Auto integration.

---

#### **Cons**

1. **High Cost of Ownership**

BMWs, especially luxury models like the 6 Series, come with high maintenance and repair costs. Parts, labor, and specialized servicing (e.g., for the N63 engine or electric components in a conversion) can be expensive. The 330e conversion may also require additional electrical work, adding to upfront and long-term expenses.

2. **Complexity of Electric Conversion (330e)**

While a 330e conversion offers efficiency, it introduces complexity. Aftermarket electric conversions are not factory-supported, meaning warranty coverage is limited or nonexistent. Potential issues with battery degradation, charging infrastructure, or motor reliability could arise over time. The conversion may also void certain manufacturer warranties.

3. **Limited Range (Electric Mode)**

Unlike a dedicated electric vehicle (e.g., Tesla or a plug-in hybrid), the 330e conversion s range in fully electric mode is likely limited (possibly under 100 miles, depending on the battery setup). This could be restrictive for long-distance driving without charging stops.

4. **Depreciation**

Luxury vehicles, including BMWs, depreciate quickly. Even a well-maintained 628i may lose a significant portion of its value over three to five years. The aftermarket conversion could further reduce resale appeal unless it s a rare or highly sought-after setup.

5. **Maintenance and Reliability Concerns**

The N63 engine (in the non-converted 628i) has a reputation for reliability issues, particularly with turbocharger failures and oil consumption. While the 330e avoids these problems, the electric components (battery, motor, inverter) may require specialized maintenance that isn t widely available. Poorly executed conversions could lead to electrical or mechanical failures.

6. **Charging Infrastructure for 330e**

If the conversion includes a plug-in capability, finding charging stations may be inconvenient, especially in rural areas. Home charging requires installation of a charging unit, which adds to the upfront cost.

7. **Insurance Costs**

Luxury and high-performance vehicles (including electric conversions) typically have higher insurance premiums due to their value and repair costs. The 628i, especially in a modified or converted form, could be expensive to insure.

8. **Resale Challenges for Converted Models**

A 330e conversion is not a factory BMW, which could deter potential buyers. Sellers may need to justify the conversion s value, and finding a buyer who appreciates the modification could be difficult. The vehicle may end up being a niche or collector s item rather than a mainstream purchase.

9. **Potential for Overcustomization**

While customization is a pro, overdoing it (e.g., excessive weight from aftermarket parts, poor battery placement) could negatively impact performance, handling, or efficiency. Poorly executed conversions may also reduce the car s reliability.

10. **Environmental and Ethical Considerations**

While the 330e conversion reduces emissions, the production of batteries (especially lithium-ion) has environmental costs. Additionally, the conversion may involve recycling or disposing of the original engine, which could raise ethical questions for some buyers.

---

### **Conclusion**

The 2021 BMW 628i (BM1321) with a roof motor (330e electric conversion) is an intriguing option for buyers seeking a blend of luxury, performance, and hybrid efficiency. It appeals to those who want a high-end BMW experience without the high cost of a factory plug-in hybrid or a dedicated electric vehicle. The conversion offers the potential for improved fuel economy and reduced emissions, while the 6 Series driving dynamics and interior luxury remain unmatched.

However, the downsides particularly the complexity and unreliability of aftermarket electric conversions, high maintenance costs, and potential resale challenges cannot be ignored. The 330e setup is not a factory-supported solution, meaning buyers must be prepared for potential technical issues, limited warranty coverage, and the need for specialized maintenance. Additionally, the 628i s high cost of ownership and depreciation are inherent to the BMW brand.

For buyers who prioritize performance, luxury, and are willing to manage the complexities of an electric conversion, this vehicle could be a rewarding purchase. However, those seeking a hassle-free, high-resale-value luxury car may find better options in factory plug-in hybrids (e.g., BMW 640e) or dedicated electric vehicles.

---

### **Recommendation**

- You are an experienced car enthusiast comfortable with aftermarket modifications and potential technical challenges.

- You prioritize driving dynamics, luxury, and hybrid efficiency over long-term reliability and resale value.

- You have access to charging infrastructure (for the 330e) and are prepared for higher maintenance costs.

- You plan to keep the vehicle for a short period (e.g., 3-5 years) and are not overly concerned about depreciation.

- You value the uniqueness of an electric conversion in a high-performance BMW.

- You seek a low-maintenance, high-resale-value luxury vehicle with factory support.

- You are concerned about the reliability of aftermarket electric components or lack access to specialized mechanics.

- You prioritize long-term cost savings and environmental sustainability over performance and novelty.

- You plan to keep the vehicle for an extended period and want to minimize depreciation risks.

- **Factory Plug-In Hybrid:** BMW 640e (if available) offers a more reliable and supported hybrid option with better resale value.

- **Dedicated Electric Vehicle:** Tesla Model S or Porsche Taycan for a fully electric experience with stronger warranty and support.

- **Non-Hybrid 6 Series:** A 630i or 640i (non-hybrid) if you prefer the original engine without conversion complexities.

- **Used or Certified Pre-Owned:** A well-maintained used 628i (without conversion) could offer better value for money with lower risk.

Details:

If something is wrong with an order, we certainly do want to help you. Free shipping only applies to items you keep. Please compare part numbers BEFORE purchasing. Quality, Assured Parts All are Quality Tested Inspected.

330E 2021 Roof Motor 9355942: REAR SUNROOF MOTOR Included: Hassle-free 1 Year Warranty Our Part #: 9355942. Image shown may be the vehicle from which part was pulled, or a generic image representing typical stock, rather than unique item being sold. Very happy customer, excellent value and service. Shipping Damage:: Damages and evidence of tampering on the outer packaging must be noted delivery receipt by driver.

Easy to find parts that don't require a mechanics knowledge. Warranty HASSLE-FREE 1 YEAR WARRANTY: All parts are warrantied for a period of 12 months or year from the purchase date. More Parts: 1 Year Warranty. Please disregard other fitment charts they may not be correct.

part #: 330e price

• $125.00

specifications sunroofconverti:

• for models: 330e
• for makes: Bmw
• for years: 2021
• part type: Motor
• conditions options: Rear Sunroof Motor
• genuine oem: Yes
• ipn: 628.bm1321
• warranty: 1 Year

offer sunroofconverti:

• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock
• quantity: 1
• started: March 9, 2026

general sunroofconverti:

• condition: Used
• Exterior Parts Accessories > Roofs, Tops Sunroofs > Sunroofs Parts

returns sunroofconverti:

• time: 60 Days
• policy: Returns Accepted
• paid by: Buyer

payments sunroofconverti:

• wallet: Paypal
• credit card: Mastercard
• other

seller sunroofconverti:

• # reviews: 23093
• city: Rancho Cordova, California
• rating: 97.1%

shipping sunroofconverti:

• service: Flat Rate Freight
• class: Freight
• type: Fixed
• cost: $20.00

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