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  3. MAZDA B25D-58-580C-02

MAZDA B25D-58-580C-02 Regulator Handle Crank

fits make: Mazda. year: 2004–2009.

B25d-58-580c-02 Mazda 2004-2009 Oem Genuine Regulator Handle Crank Black

( Manufacturer Part Number: B25D-58-580C-02 ), ( Part Type: Handle Regulator Crank ), ( Year: 2004 2005 2006 2007 2008 2009 ), ( Fitment Type: Direct Replacement ), ( Color: Black ), ( Genuine Oem: Yes ), ( Replaces Part Number: B25d58580a02, B25d58580b02 ), ( Country Of Origin: Japan )

Review MAZDA Oem Genuine Regulator Handle Crank Black fits 2004–2009

The **Mazda B25D-58-580C-02 regulator handle crank** is a precision-engineered component designed specifically for Mazda s B25D engine family, covering models from the 2004 to 2009 production years, including the RX-8, RX-7 (FC), and other high-performance applications. This part serves as a critical linkage in the engine s fuel injection system, regulating the precise flow of fuel by controlling the movement of the regulator handle, which in turn adjusts the pressure within the fuel rail. Crafted from high-grade materials, the crank is built to withstand the demanding conditions of high-performance driving, ensuring durability and reliability under sustained load. Its design incorporates a robust shaft and finely machined threads, allowing for smooth and consistent operation while minimizing wear over time. The component is engineered to maintain optimal fuel delivery efficiency, contributing to the engine s performance, throttle response, and overall longevity. Whether used in stock applications or as part of a tuned setup, this regulator handle crank ensures that the fuel system operates at peak performance, reducing the risk of fuel starvation, misfires, or premature failure of related components. For enthusiasts and mechanics seeking a direct-fit, high-quality replacement for their Mazda s fuel injection system, this part offers a seamless upgrade that aligns with the engine s original specifications while enhancing its reliability.

### Pros and Cons of Buying a Mazda B25D-58 (2004 2009) Regulator Handle, Crank (Part #58-580C-02)

#### **Pros:**

1. **Direct Fitment** This part is designed specifically for the Mazda B25D-58 engine (common in models like the RX-8, B2500, and some B-series trucks), ensuring compatibility without modification.

2. **Reliability** Mazda s regulator handle and crank assembly is a mechanical component with fewer electronic dependencies, reducing failure risks tied to complex systems.

3. **Affordability** Compared to full engine rebuilds or replacements, this part is relatively inexpensive, making it a cost-effective solution for throttle response issues.

4. **Easy Replacement** The part is accessible and can often be replaced without major disassembly, saving labor costs if tackled as a DIY project.

5. **Prevents Further Damage** A faulty regulator handle can cause erratic throttle response, stalling, or even damage to the throttle body or wiring over time. Replacing it early can avoid more extensive repairs.

6. **Aftermarket Availability** While OEM parts may be harder to find, aftermarket equivalents (e.g., from brands like ACDelco or Moroso) are often available at reasonable prices.

7. **Minimal Tuning Needed** Unlike fuel or ignition components, replacing this part typically doesn t require ECU reprogramming or additional adjustments.

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#### **Cons:**

1. **Age of the Part** Parts from this era (2004 2009) may be harder to source, especially OEM originals, leading to longer wait times or reliance on aftermarket alternatives.

2. **Wear on Related Components** If the issue stems from prolonged neglect (e.g., carbon buildup in the throttle body), replacing just the handle may not fully resolve symptoms. A throttle body cleaning or inspection might be necessary.

3. **Potential Counterfeit Risks** Cheap aftermarket parts may fail prematurely or lack durability, especially if sourced from untrusted sellers.

4. **Labor Costs** If professional installation is required, labor fees could offset the part s low cost, particularly in markets with high hourly rates.

5. **Symptom Misdiagnosis** Throttle response issues might originate from other sources (e.g., vacuum leaks, faulty throttle position sensor, or wiring harness problems). A thorough diagnosis is critical to avoid wasting money on the wrong part.

6. **Durability Concerns** Plastic or rubber components in the regulator handle may degrade over time, especially in high-mileage engines, requiring eventual replacement again.

7. **Limited Longevity Guarantees** Unlike modern OEM parts, older components may lack warranties or return policies, leaving the buyer responsible for any failures post-installation.

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### **Conclusion:**

The Mazda B25D-58 regulator handle crank (part #58-580C-02) is a practical and affordable fix for throttle-related issues in compatible vehicles, provided the problem is accurately diagnosed. Its simplicity and direct fitment make it a low-risk upgrade for mechanical concerns. However, the part s age, potential counterfeit market risks, and the need for complementary inspections (e.g., throttle body cleaning) are key considerations. If the vehicle s symptoms align with regulator handle failure and the part is sourced from a reputable supplier, this replacement is a sound choice. For long-term reliability, pairing it with a throttle body service and ensuring no underlying electrical issues exist will maximize its effectiveness.

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### **Recommendation:**

1. **Verify the Diagnosis** Confirm the issue is isolated to the regulator handle by checking for vacuum leaks, TPS (throttle position sensor) faults, or wiring integrity. Use a scan tool to rule out ECU-related problems.

2. **Source the Part Carefully** Purchase from a trusted supplier (e.g., RockAuto, eBay with verified sellers, or a local Mazda specialist) to avoid counterfeit or low-quality replacements.

3. **Consider a Throttle Body Cleaning** If the engine has high mileage, cleaning the throttle body with carb cleaner or a professional service may be necessary to complement the handle replacement.

4. **DIY vs. Professional Installation** If comfortable with basic engine work, replacing the part yourself can save labor costs. Otherwise, consult a mechanic familiar with Mazda engines.

5. **Monitor Post-Installation** After replacement, test drive the vehicle to ensure the throttle responds smoothly. If issues persist, revisit the diagnosis or inspect for installation errors.

6. **Budget for Contingencies** Allocate extra funds for potential complementary repairs (e.g., TPS replacement, wiring repairs) if symptoms don t fully resolve.

**Final Verdict:** This part is a **worthwhile purchase** for targeted throttle issues in the B25D-58, but it should be part of a broader diagnostic and maintenance approach to ensure lasting reliability.

Details:

2004 - 2009 OEM Genuine Mazda Regulator Handle, Part Number B25D-58-580C-02 Black Handle.

part #: b25d58580c02 prices

  • $13.07-$13.98

specifications cardoorhandleei:

  • for makes: Mazda
  • for years: 2004-2009
  • mpn: B25d-58-580c-02
  • part type: Handle Regulator Crank
  • year: 2004 2005 2006 2007 2008 2009
  • fitment type: Direct Replacement
  • color: Black
  • genuine oem: Yes
  • replaces part number: B25d58580a02, B25d58580b02
  • country of origin: Japan

offer cardoorhandleei:

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

general cardoorhandleei:

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

payments cardoorhandleei:

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

returns cardoorhandleei:

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

shipping cardoorhandleei:

  • cost: $5.07
  • service: USPS Ground Advantage
  • transit: 3-9 Days
  • type: Calculated
  • carrier: USPS
  • class: Standard

seller cardoorhandleei:

  • # reviews: 2124
  • city: Baraga, Michigan
  • rating: 100.0%
for makes: mazda, for years: 2004-2009, part type: handle regulator crank, year: 2004 2005 2006 2007 2008 2009, fitment type: direct replacement, genuine oem: yes, replaces part number: b25d58580a02, b25d58580b02, country of origin: japan,
manufacturer: mazda, category: auto parts > car truck parts accessories > interior parts accessories > window cranks, grab handles door pulls, color: black, sku: 23782644079710892,
Mazda B25D-58-580C-02 Is Similar To:
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2 offers $13.07–$13.98 USD
  • New. Offer #1 priced at $13.98 + $4.98 shipping estimate = $18.96* total. 2004-2009 OEM Genuine Mazda Regulator Handle.+$4.98 shipping
  • New. Offer #2 priced at $13.07 + $15.00 shipping estimate = $28.07* total. Genuine Mazda Parts.+$15.00 shipping

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