MAZDA NA01-56-840 Trunk Latch Lid Lock

( Manufacturer Part Number: NA01-56-840 ), ( Type: Trunk Lid ), ( Vintage Part: No ), ( Country Of Origin: Japan )

Review MAZDA Trunk Latch Lid Lock Oem fits MIATA 1990–1997

The **Mazda NA01-56-840 Miata Trunk Latch Lid Lock** (compatible with 1990 1997 models) is a precision-engineered aftermarket component designed to enhance both the security and functionality of your beloved MX-5 Miata. Crafted from high-quality, durable materials, this latch mechanism is built to withstand the rigors of daily use while maintaining a seamless, reliable operation that mirrors the factory design. The NA01-56-840 is a direct replacement for the stock trunk latch, ensuring an exact fit with the Miata s body structure, whether you re driving a base model or a more premium variant from this era. Its robust construction includes a reinforced latch arm and a secure locking mechanism, preventing accidental or forced opening ideal for those who prioritize both convenience and security. The design incorporates smooth-moving hinges and a sturdy latch bolt, reducing wear over time and minimizing the risk of jamming, a common issue with aging or lower-quality aftermarket parts. Whether you re looking to restore your Miata s original functionality after a repair or upgrade for added peace of mind, this latch is a straightforward yet effective solution. Its compatibility extends beyond basic models, making it a versatile choice for enthusiasts who appreciate both authenticity and performance. Installing the NA01-56-840 is a straightforward process, often requiring only basic tools, and it serves as an excellent opportunity to refresh other components of the trunk area, such as the lid or interior trim, for a cohesive upgrade. For owners who cherish the Miata s lightweight, sporty character, this latch ensures that the trunk remains a reliable and secure feature without compromising the car s agile handling or classic aesthetic.

Buying a **1990 1997 Mazda MX-5 Miata (NA01-56-840) with a trunk latch lid lock** has its advantages and disadvantages, depending on your priorities, budget, and experience level. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying a 1990 1997 Mazda MX-5 Miata with a Trunk Latch Lid Lock**

1. **Classic and Desirable Design**

The NA platform (1990 1997) is widely regarded as one of the most iconic roadsters of all time. Its retro styling, lightweight construction, and open-top driving experience make it highly appealing to enthusiasts. The trunk latch lid lock (a feature added in later NA models, particularly from 1994 onward) adds a touch of luxury and convenience, making the car more practical for daily use.

2. **Strong Community and Aftermarket Support**

The Miata has a massive following, with extensive aftermarket parts, forums (like Mazdaspeed.com, MX5.net, and Miata.net), and clubs. This means finding help for repairs, modifications, or restoration is relatively easy. The trunk lid lock mechanism, while rare in early models, is also well-documented in later NA models, making it easier to source parts or learn how to fix it.

3. **Reliability and Simplicity**

The NA Miata is known for its straightforward mechanical design, making it easier to maintain than more complex modern cars. The engine (the 1.6L or 1.8L inline-four) and transmission (5-speed manual or optional 4-speed auto in later models) are robust and durable if properly cared for. The trunk lid lock system, while not critical to the car s function, is a minor mechanical addition that doesn t significantly impact reliability.

4. **Great Driving Dynamics**

The Miata s rear-wheel-drive layout, lightweight chassis, and precise handling make it an exceptional driver s car. The trunk lid lock (if functional) doesn t affect performance but adds a small convenience, such as preventing the trunk from opening accidentally while driving.

5. **Potential for Modifications**

The NA platform is highly modifiable, from engine upgrades (e.g., 1.8L turbo kits, 2.0L conversions) to suspension tweaks and bodywork. The trunk lid lock can be removed or replaced if you prefer a simpler setup, giving you flexibility in customization.

6. **Affordability (Compared to Later Models)**

While prices vary, NA Miatas are generally more affordable than later models (NB, NC, or ND), making them a good entry point for Miata ownership. A well-maintained example with a trunk lid lock can be found at a reasonable price, especially if it s a later model (1994 1997) where the feature is more common.

7. **Nostalgia and Collectibility**

For enthusiasts who appreciate the original NA design, owning one especially with a trunk lid lock can be a point of pride. Later NA models (1994 ) with the trunk lid lock are slightly more desirable than early ones, as this feature was a minor upgrade.

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### **Cons of Buying a 1990 1997 Mazda MX-5 Miata with a Trunk Latch Lid Lock**

1. **Aging Mechanical Components**

- **Suspension (shocks, bushings, ball joints, control arms):** These degrade over time and can lead to handling issues.

- **Brakes (pads, rotors, calipers):** Aftermarket upgrades are often necessary for modern stopping power.

- **Exhaust and emissions systems:** Later models (especially 1995 1997) have stricter emissions controls, which can be finicky or require modifications.

- **Trunk lid lock mechanism:** While rare in early models, the latch itself can wear out or break, requiring replacement or adjustment. The lock may also be prone to sticking or failure if not maintained.

2. **Rust (Especially in Older Models)**

Early NA Miatas (1990 1992) are notorious for rust, particularly in the wheel wells, rocker panels, and subframe. Even later models can suffer if they were driven in harsh conditions. A thorough inspection (or rustproofing history) is essential before purchasing.

3. **Fuel Economy and Power Limitations**

The base 1.6L engine (1990 1993) is underpowered by modern standards, producing around 116 128 horsepower. Later models (1994 1997) upgraded to the 1.8L engine (133 140 hp), which is better but still lacks the power of today s small cars. Fuel economy is decent (25 35 MPG) but not exceptional.

4. **Trunk Lid Lock Can Be a Liability**

- The mechanism may require occasional lubrication or adjustment to prevent sticking.

- If the lock is broken or non-functional, it can be a hassle to repair, especially in older models where parts are harder to find.

- Some owners prefer to remove the lock entirely for simplicity, which may reduce resale value.

5. **Maintenance Costs**

While the Miata is relatively cheap to maintain, parts and labor can add up, especially if you re not mechanically inclined. Common maintenance items include:

- Timing belt and water pump replacement (every 60,000 100,000 miles).

- Spark plugs, coils, and ignition components (prone to failure in older models).

- Clutch (if manual) or transmission fluid changes (if automatic).

- Regular fluid checks (coolant, brake, power steering, differential).

6. **Weather Limitations**

The Miata is an open-top car, meaning it offers no protection from rain, wind, or cold weather. While this is part of its charm, it can be impractical for daily use in harsh climates.

7. **Resale Value Depreciation**

While the NA Miata holds its value reasonably well, it depreciates over time. If you plan to sell later, a well-maintained example with a trunk lid lock may not retain as much value as a restored or heavily modified Miata.

8. **Potential for Hidden Issues**

- **Engine issues:** Knocking, oil leaks, or exhaust manifold cracks (common in the 1.6L engine).

- **Transmission problems:** Early manual transmissions (especially in 1990 1992) can be rough; later models improved this.

- **Electrical gremlins:** Later models have more electronics (e.g., fuel injection, sensors), which can fail over time.

- **Frame or subframe rust:** Always inspect these areas thoroughly.

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### **Conclusion**

- **Value classic design and driving dynamics** over modern convenience.

- **Are prepared for basic maintenance** and don t mind occasional mechanical quirks.

- **Prioritize fun over practicality** and enjoy the open-top experience.

- **Find a well-documented example** with a service history, especially if the trunk lid lock is in good condition.

- **Plan to modify or restore the car** as a long-term project.

- **Need a reliable daily driver** with modern safety and comfort features.

- **Are unwilling to spend time or money on maintenance.**

- **Prefer a car with better fuel economy, power, or weather protection.**

- **Find a Miata with rust, mechanical issues, or a faulty trunk lid lock mechanism.**

---

### **Recommendation**

1. **Focus on Later Models (1994 1997)**

These years introduced the 1.8L engine, improved emissions systems, and (in some cases) the trunk lid lock. They re also less prone to early rust issues.

2. **Prioritize Rust-Free Examples**

Inspect the wheel wells, rocker panels, subframe, and floor pans for rust. A rustproofing certificate or recent treatment is a plus.

3. **Check the Trunk Lid Lock Mechanism**

- Ensure the lock operates smoothly and isn t corroded.

- Test the latch to confirm it doesn t stick or break when engaged.

- Be prepared to replace the lock or latch if it s worn out.

4. **Verify Maintenance History**

- Regular oil changes (synthetic oil is ideal).

- Timing belt replacements (if due).

- Suspension and brake updates.

5. **Test Drive Thoroughly**

- Listen for unusual noises (knocking, rattles, whining).

- Check for smooth shifting (if automatic) or clutch engagement

Details:

Trusted by thousands of fellow enthusiasts and builders. Motor sports Parts Graphics, Built by enthusiasts, for enthusiasts. Questions about fitment or condition. Mazda Miata Trunk Latch Lid Lock 1990 1997 OEM: Tested and verified before removal.

Motor sports Parts Graphics: M.P.G. Carefully packaged for safe delivery.

part #: na0156840 prices

• $8.30-$21.51

specifications trunklipa:

• for models: Miata
• for makes: Mazda
• for years: 1990-1997
• mpn: Na01-56-840
• type: Trunk Lid
• vintage part: No
• country of origin: Japan

payments trunklipa:

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

general trunklipa:

• condition: Used
• Exterior Parts Accessories > doors, Trunk Lids Hatches > Hatches Trunk Lids

offer trunklipa:

• best offers: True
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: February 16, 2026
• sold: 0

seller trunklipa:

• rating: 100.0%
• city: Cedarburg, Wisconsin
• # reviews: 1594

returns trunklipa:

• policy: No Returns

shipping trunklipa:

• class: Standard
• carrier: USPS
• transit: 4-9 Days
• type: Fixed
• service: USPS Ground Advantage
• cost: $0.00

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