Product Overview
This high-precision Rear Left ABS Wheel Speed Sensor is a professional-grade replacement engineered specifically for the Mazda 323 and Mazda Protege (1999–2003). It is a direct-fit unit for original equipment (OE) part number B25D-43-71YB, ensuring that the vehicle's anti-lock braking and electronic stability systems receive accurate, real-time data.
OE Part Numbers: Direct replacement for B25D-43-71YB, B25D4371YB, and ALS1133.
Vehicle Application: Precision-matched for the Mazda 323 and Mazda Protege (including Protege5) for model years 1999, 2000, 2001, 2002, and 2003.
Core Technology: Optimized for fast response and high signal accuracy, which are essential for maintaining traction and safety under diverse driving conditions.
Technical Specifications
Harness & Connector: Features a 30-inch (760 mm) heavy-duty harness with a single rectangular male connector.
Terminals: Utilizes 2 female blade-type terminals for a secure, moisture-resistant electrical connection.
Mounting: Designed for wheel mounting via a stable 2-bolt hole configuration to ensure precise sensor alignment.
Durability: Built with a high-strength housing designed for a low failure rate and stable performance in harsh under-vehicle environments.
OE Numbers
Wholesale & Manufacturing Advantages
Certified Excellence: Manufactured in facilities holding IATF 16949, ISO 9001, ISO 14001, and CE certifications, meeting global automotive standards.
Massive Production Scale: An annual capacity of 5 million units guarantees a stable and scalable supply chain for global distributors.
Full Customization: Supports comprehensive OEM/ODM services, including specific material upgrades and customized branding or packaging (Brand, Neutral, or Private Label).
Service Commitment: Backed by an industry-leading 36-month warranty with flexible lead times of 7–60 days and a Minimum Order Quantity (MOQ) of 100 units.
The ABS Wheel Speed Sensor for Mazda Protege is the ideal choice for wholesalers looking for a reliable, long-lasting safety component for the Mazda 323/Protege platform.
Mazda ABS Sensor solutions: Customization, global sourcing, and OEM quality
Complete ABS Sensor Solutions for Global Markets
Backed by a vast network of vetted manufacturers in China, Elecdura helps global buyers source ABS sensors with brand-level quality at unbeatable factory pricing.
From design optimization to packaging customization, from bulk stock supply to certification support — we are the sourcing partner B2B buyers trust.
At Elecdura, we offer an extensive range of ABS sensors to fit a wide variety of vehicles, including passenger cars, commercial trucks, and specialty applications.
With dozens of connector types, cable lengths, sensor heads, and mounting structures, we ensure high compatibility with both OEM and aftermarket platforms. For large-volume or long-term customers, we provide fully customizable solutions based on your specifications or reference samples:
- Cable length & plug type customization
- Sensor housing & material adjustments
- Custom branding (logo, part number, label)
- Tailored packaging for retail or bulk
Whether you require a one-to-one replacement or a private-label solution, our engineering and production teams are ready to support you from development to delivery.
Mazda ABS Sensor: Engineered with globally trusted component partners
Behind every stable signal and durable sensor lies a foundation of trusted materials. At Elecdura, we only work with globally recognized suppliers to ensure every ABS sensor delivers the performance, longevity, and safety our customers demand.
Our key component partners include:
Infineon – High-reliability semiconductor chips
Melexis – Advanced automotive sensing ICs
Allegro Microsystems – Magnetic field sensing solutions
FPK / Semiment – Core electronics and magnetic circuit components
LEONI – Premium automotive-grade cables
ELEKTRISOLA – Precision copper wire & winding materials
These partnerships help us deliver consistent product quality across batches, reduce field failure rates, and meet OE-level reliability standards.
Elecdura ABS Sensor | IATF Certified, Global Compliance Support
At Elecdura, quality is engineered and certified. Our production facilities operate under the IATF 16949 quality management system and comply with ISO 14001 for environmental and occupational health standards.Whether you need to meet EMC, REACH, RoHS, or other regional regulations, our engineering and compliance teams are experienced in supporting custom certification requirements across Europe, North America, South America, and Asia-Pacific.We have supported OEM projects and aftermarket clients in obtaining certifications and test reports for various target markets, ensuring smooth market entry and compliance.Let us know your local requirements — we'll make sure your ABS sensors are ready.
Mazda ABS Sensor In-House Production: Molded, Assembled, Packed, and Shipped
Precision-molded housings form the structural backbone of every ABS sensor. Our in-house injection lines ensure dimensional accuracy, high waterproof ratings, and consistent material strength across batches.
Our semi-automated assembly lines integrate signal cores, connectors, and cables with tight tolerance control. Standardized procedures ensure consistent signal output and plug compatibility for every sensor.
Final inspections are followed by flexible packing lines that support both bulk industrial cartons and customized retail boxes. With digital inventory management and global shipping support, we ensure fast order fulfillment and clean outbound handling.
Mazda ABS Sensor Advanced Equipment Showcase
To ensure every ABS Sensor meets performance expectations, Elecdura continuously invests in advanced production and testing equipment.
Strict Inspection for Mazda ABS Sensor
Every ABS Sensor from Elecdura undergoes a rigorous multi-step quality inspection process before shipment.Our factory implements strict control standards throughout production — from material inspection to final signal testing — to ensure signal accuracy, durability, and safety in real-world use.
Mazda ABS Sensor Supplier Strong Export Capability and Stable Supply
Elecdura ensures large-scale, stable supply of alternators to global markets. Each pallet and carton is meticulously packaged to export standards for secure transport. Leveraging years of export expertise and consistent demand from long-term clients, we provide reliable delivery assurance and supply chain continuity for bulk orders.
ABS Sensor Supplier Partnership Drives Market Success for Top Distributors
Elecdura collaborates with leading distributors and brands worldwide — helping our partners dominate their local aftermarket. Through professional sourcing, customized product development, and close market research, we've supported clients in becoming the Top 1 aftermarket suppliers in South America (in some categories). Our integrated marketing and supply capabilities make us more than a factory — we're your strategic growth partner.
 Successful client collaboration showcased at trade fair booth | |  Distributor partnership meeting for aftermarket product planning | |  Elecdura with international buyer in Brazil Exhibition |
 Elecdura assisting South American client in aftermarket development | |  Elecdura team and partners at international auto parts exhibition | |  Warehouse of Elecdura global partner displaying stocked |
FAQ-ABS Sensor - B25D4371YB
Q1: Which vehicle is this part for? How is it different from the "B25D4372YB" we just saw?
A: This part (B25D4371YB) is also specifically for the Mazda Protégé, but for the 1999-2003 model years, starting one year earlier than the B25D4372YB (2000-2003) we just reviewed. The core difference between them is the number of bolt holes: B25D4371YB has 2, while B25D4372YB has 4. They are two separate parts for different positions or configurations and are not interchangeable.
Q2: What are its key installation specifications?
A: The core installation specifications are: 1 rectangular male connector, a harness length of 760 mm (approx. 30 inches), and mounting at the Wheel location via 2 bolt holes. Note: the "Terminal Quantity" field is incorrectly labeled as "Female"; based on the context that "Terminal Type" is "Blade," it should have 2 terminals.
Q3: There is an obvious error in the product page information. Will this affect the purchase?
A: The erroneous labeling of "Terminal Quantity" does cause confusion and increases purchasing risk because it affects the accurate understanding of the part's electrical interface. This indicates a lack of rigor in product data entry or maintenance. Therefore, when purchasing, you must not rely solely on the page information. Verifying the physical old part removed from your vehicle must be the final basis, and consider requesting clear photos of the actual product from the supplier for secondary confirmation before buying.
Q4: Why are there so many different part number sensors for the Protégé?
A: This accurately reflects the complexity of automotive parts, primarily due to three reasons:
1. Different Wheel Positions: Sensors for front/rear or left/right wheels may have different designs (harness length, mounting method).
2. Model Year/Configuration Updates: There may have been minor design changes to components during the 1999-2003 production run.
3. Supplier or Batch Differences: Equivalent parts produced by different suppliers may be assigned different part numbers.
Therefore, even for the same vehicle model, the one and only correct part must be identified based on the specific vehicle year and the physical old part.
Q5: Faced with information errors and similar parts, how can I ensure a foolproof purchase?
A: To ensure a foolproof purchase, please perform the following triple precise verification:
1. Verify Old Part Number: Remove the old sensor and confirm its part number must be "B25D4371YB".
2. Verify Physical Characteristics: Simultaneously verify that the old part has the key features of "2 bolt holes" and a harness approximately 760 mm long. This effectively distinguishes it from other similar parts (e.g., B25D4372YB has 4 holes).
3. Seek Physical Evidence: Given the page information error, requesting high-resolution photos of the actual part from the supplier for final confirmation is a crucial step to compensate for the information deficiency.
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