NISSAN 73940-9DE0B Assist Strap

( Manufacturer Part Number: 73940-9DE0B ), ( Part Type: Strap Assist ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Year: 2019 2020 2021 2022 2023 ), ( Parts Included: Only Part Reference 3 On The Diagram Is Included ), ( Replaces Part Number: 739409dj0b )

Review NISSAN Genuine Assist Strap fits MAXIMA 2019–2023

The **Nissan 73940-9DE0B Assist Strap** is a high-performance, precision-engineered component designed to enhance the functionality and reliability of Nissan s advanced driver-assistance systems (ADAS) and vehicle stability features. This critical part serves as a vital linkage within the vehicle s electronic stability control (ESC) and traction control systems, ensuring seamless communication between the steering wheel, suspension, and braking mechanisms to optimize handling and safety. Crafted from durable, high-grade materials, the Assist Strap is engineered to withstand extreme conditions, including high temperatures, vibrations, and mechanical stress, making it an indispensable element for maintaining optimal vehicle dynamics. Its sleek, aerodynamic design integrates seamlessly with Nissan s advanced chassis architecture, allowing for precise adjustments in steering torque and suspension response, which are essential for both everyday driving comfort and high-performance maneuvering. Whether navigating tight corners, gliding through sharp turns, or maintaining stability during sudden evasive maneuvers, this Assist Strap plays a pivotal role in delivering the responsive and predictable behavior that Nissan vehicles are renowned for. Built to exacting specifications, it ensures long-term durability and compatibility with a wide range of Nissan models, making it a must-have replacement for drivers seeking to restore or upgrade their vehicle s handling capabilities. With its robust construction and seamless integration into the vehicle s electronic systems, the Nissan 73940-9DE0B Assist Strap exemplifies the brand s commitment to innovation, safety, and performance.

The **Nissan 73940-9DE0B Assist Strap** is a part of the vehicle s **driver s seat belt retractor assembly**, which helps deploy the seat belt during a collision. Below is a detailed breakdown of its pros, cons, and a final recommendation.

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### **Pros of buying a Nissan 73940-9DE0B Assist Strap**

1. **Direct OEM Replacement** This part is manufactured to match Nissan s original equipment specifications, ensuring proper fit, functionality, and compatibility with the seat belt system. It reduces the risk of improper installation or failure during deployment.

2. **Safety-Critical Component** The assist strap is part of the **seat belt retractor mechanism**, which is essential for proper seat belt deployment in a crash. A faulty or worn strap can impair the belt s performance, increasing injury risk.

3. **Durability and Longevity** High-quality OEM or aftermarket parts (if sourced from reputable brands) are designed to withstand repeated use and environmental stress (heat, cold, UV exposure). This extends the lifespan of the seat belt system.

4. **Warranty Coverage** If purchased from an authorized Nissan dealer or a trusted aftermarket supplier, the part may come with a warranty, providing peace of mind against premature failure.

5. **Prevents Further Damage** If the original strap has worn out or failed, replacing it can prevent the seat belt from malfunctioning entirely, which could lead to more extensive (and costly) repairs to the retractor or airbag system.

6. **Easy Installation** Unlike some complex automotive parts, the assist strap is relatively straightforward to replace, often requiring only basic tools. Many owners or mechanics can install it without professional assistance.

7. **Cost-Effective Repair** Replacing just the assist strap is significantly cheaper than replacing an entire seat belt retractor or dealing with airbag system failures that may result from a faulty belt.

8. **Maintains Vehicle Resale Value** Keeping safety-critical components in good working order helps preserve the vehicle s value, as potential buyers will be reassured by a fully functional seat belt system.

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### **Cons of buying a Nissan 73940-9DE0B Assist Strap**

1. **Limited Availability of Aftermarket Parts** While OEM parts are guaranteed to fit, aftermarket alternatives may be harder to find for this specific part number. Some suppliers may not stock it, leading to delays or higher prices.

2. **Potential Counterfeit Parts** If purchasing from untrusted sources (e.g., unlicensed online sellers), there is a risk of receiving **counterfeit or low-quality parts**. These may fail prematurely or not meet safety standards.

3. **Mixed Quality in Aftermarket Options** Even if an aftermarket part is available, quality varies widely. Some may be made from inferior materials, leading to early wear or failure, especially under stress (e.g., during a collision).

4. **Diagnostic Challenges** If the seat belt warning light is on, the issue might not always be the assist strap it could be a faulty retractor motor, wiring, or sensor. Replacing just the strap without diagnosing the root cause may lead to recurring problems.

5. **Labor Costs (If Professional Installation Is Needed)** While the part itself is relatively inexpensive, if the owner lacks mechanical experience, hiring a mechanic to replace it may add to the cost.

6. **Potential for Incorrect Installation** Improper installation (e.g., misalignment, improper tension) can cause the seat belt to malfunction. This risk is higher if the owner attempts a DIY replacement without proper guidance.

7. **Environmental Factors** Exposure to extreme temperatures, moisture, or chemicals (e.g., road salt, gasoline fumes) can degrade the strap over time, even if it s a high-quality part.

8. **Limited Lifespan** Like all seat belt components, the assist strap has a finite lifespan. Even if it hasn t failed yet, it may need replacement as part of routine maintenance, especially in older vehicles.

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### **Conclusion**

The **Nissan 73940-9DE0B Assist Strap** is a **critical but relatively simple** part to replace when the seat belt system exhibits issues. Its primary advantage lies in **safety and reliability**, as a failing seat belt can compromise passenger protection in a crash. The part is **cost-effective to replace** compared to broader system failures, and when sourced correctly, it ensures long-term functionality.

However, the **main risks** stem from **quality control** (counterfeit parts, inferior aftermarket options) and **diagnostic uncertainty** (ensuring the strap is indeed the problem). If the seat belt warning light is active or the belt fails to retract properly, **verifying the issue with a mechanic before purchasing** is advisable.

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### **Recommendation**

1. **Verify the Problem First** Before buying, confirm that the assist strap is the faulty component. A mechanic can diagnose whether the issue lies in the strap, retractor motor, or wiring. This prevents unnecessary purchases if another part is at fault.

2. **Purchase from a Trusted Source**

- **Authorized Nissan Dealers** (for OEM parts with warranty).

- **Reputable Online Retailers** (e.g., RockAuto, AutoZone, Amazon with verified sellers) that specialize in automotive parts.

- Avoid **unknown sellers** or **eBay/AliExpress** unless they have strong reviews and return policies.

3. **Choose OEM or High-Quality Aftermarket**

- **OEM (Nissan part)** is the safest choice for reliability and warranty coverage.

- If opting for aftermarket, select brands known for seat belt components (e.g., Dorman, Bosch, ACDelco).

4. **Follow Installation Guidelines Carefully**

- Refer to a **Nissan service manual** or **YouTube tutorials** for step-by-step replacement.

- Ensure the new strap is properly aligned and tensioned to avoid malfunctions.

5. **Consider Professional Installation if Unsure** If the owner lacks confidence in their mechanical skills, a **local mechanic or dealership** can install it for a modest labor fee, ensuring correctness.

6. **Replace as Part of Routine Maintenance** If the vehicle is older (10 years), consider **proactively replacing seat belt components** during routine servicing, as wear is inevitable over time.

7. **Check for Recalls or Service Campaigns** Nissan may have issued recalls or service bulletins related to seat belt retractors. Visit the **Nissan website or NHTSA recall database** to ensure no unresolved issues exist.

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**Final Verdict:** The **73940-9DE0B Assist Strap** is a **practical and necessary replacement** when needed, provided it is sourced and installed correctly. Prioritize **quality over cost** to ensure safety, and always **diagnose the issue thoroughly** before purchasing. For most drivers, this is a **straightforward repair** that maintains critical vehicle safety.

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. So, why would you choose anyone else. 2 Day Shipping applies only to the USA 50 states.

Electrical parts are not returnable.

part #: 739409de0b prices

• $40.83-$60.38

specifications cardoorhandleei:

• for models: Maxima
• for makes: Nissan
• for years: 2019-2023
• mpn: 73940-9de0b
• part type: Strap Assist
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• year: 2019 2020 2021 2022 2023
• parts included: Only Part Reference 3 On The Diagram Is Included
• replaces part number: 739409dj0b

returns cardoorhandleei:

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

seller cardoorhandleei:

• rating: 99.8%
• # reviews: 3691
• city: Surprise, Arizona

shipping cardoorhandleei:

• class: Standard
• transit: 4-9 Days
• service: Standard
• cost: $9.99
• type: Fixed

payments cardoorhandleei:

• credit card: Mastercard
• wallet: Paypal
• other

offer cardoorhandleei:

• availability: In Stock
• options: Ship-to-home
• started: April 4, 2026
• sold: 0
• quantity: 1

general cardoorhandleei:

• Car Truck Parts Accessories > Interior Parts Accessories > Window Cranks, Grab Handles Door Pulls
• condition: New

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