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NPS DOX-0257 Lambda Probe Denso
The Denso DOX-0257 Lambda Probe is a reliable and high-quality exhaust gas sensor that monitors the air-fuel mixture in your vehicle's engine. This oxygen O2 probe ensures optimal combustion, reduces emissions, and improves fuel efficiency
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NPS DOX-0257 Lambda Probe Denso
The DOX‑0257 Lambda Probe is a high‑performance oxygen sensor designed for precise control of the air‑fuel mixture in modern internal combustion engines. Developed by Denso, this probe delivers reliable readings across a wide range of operating conditions, ensuring optimal engine performance, reduced emissions, and improved fuel economy.
Key Functional Characteristics
- Type: Heated lambda sensor (planar design)
- Operating Temperature: 600 °C – 700 °C (typical for heated sensors)
- Provides a voltage output proportional to the oxygen concentration in exhaust gases.
- Designed for direct fit installation, eliminating the need for additional adapters or modifications.
- Compatible with a wide range of Toyota models, including Yaris (P1/P9), and other vehicles that use the DOX‑0257 specification.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | DOX‑0257 |
| Sensor Type | Heated planar lambda sensor (O₂) |
| Connection Pins | 4‑pin connector (typical for modern O₂ sensors) |
| Length | 330 mm (standard length for direct fit applications) |
| Operating Temperature Range | –40 °C to +120 °C (ambient), sensor temperature 600–700 °C |
| Voltage Output | 0.1 V – 0.9 V (typical for lambda sensors) |
| Response Time | ~200 ms (fast response suitable for rapid engine load changes) |
| Material | Ceramic body with platinum or palladium sensing element, protected by a heat‑resistant coating. |
| Installation Orientation | Right‑handed (R) or left‑handed (L) versions available; select based on vehicle wiring diagram. |
Performance Benefits
- Accurate Air‑Fuel Ratio Control: The sensor’s precise voltage output allows the engine control unit (ECU) to maintain stoichiometric combustion, maximizing power while minimizing fuel consumption.
- Low Emissions: By continuously monitoring exhaust oxygen levels, the DOX‑0257 helps keep tailpipe emissions within regulatory limits.
- Durability: The heated design protects the sensing element from soot and deposits, extending service life even in high‑load or heavy‑traffic conditions.
- Fast Response: Rapid voltage changes enable quick ECU adjustments during acceleration, deceleration, and transient loads.
Installation Guide
- Preparation: Disconnect the vehicle battery to prevent electrical shock. Remove any existing lambda sensor by loosening the mounting clamp or retaining screw.
- Positioning: Align the new DOX‑0257 probe with the exhaust pipe, ensuring the connector faces the correct direction (right/left as specified).
- Secure Mounting: Tighten the mounting clamp to the recommended torque specification. Avoid over‑tightening which could damage the sensor housing.
- Electrical Connection: Connect the 4‑pin connector to the vehicle’s wiring harness, matching pins for power, ground, signal, and heater control.
- Testing: Reconnect the battery. Start the engine and allow it to reach operating temperature. Verify that the ECU registers a stable voltage output within the expected range (0.1 V–0.9 V).
Compatibility Overview
The DOX‑0257 is engineered for use in Toyota models such as:
- Yaris P1/P9 (2003‑2008)
- Yaris 1.0 L and 1.3 L engines with VVT‑i or VVT‑e systems
- Other vehicles that specify the DOX‑0257 lambda sensor in their service manuals
When selecting a sensor, confirm whether a right‑handed (R) or left‑handed (L) version is required by consulting the vehicle’s wiring diagram.
Maintenance Tips
- Inspect the sensor for physical damage or corrosion after prolonged exposure to high temperatures.
- Check the heater element functionality; a non‑functional heater can lead to inaccurate readings and increased emissions.
- Replace the sensor if it shows signs of wear, such as erratic voltage output or failure to reach operating temperature quickly.
Why Choose the DOX‑0257 Lambda Probe?
The combination of a robust heated design, precise voltage output, and direct fit installation makes the NPS DOX‑0257 Lambda Probe Denso an ideal choice for technicians and automotive enthusiasts seeking reliable engine management. Its proven performance across multiple Toyota models ensures that vehicles maintain optimal combustion efficiency, leading to better fuel economy and lower environmental impact.
Conclusion
The DOX‑0257 Lambda Probe exemplifies Denso’s commitment to quality and innovation in automotive sensor technology. By delivering accurate oxygen measurements under demanding conditions, it plays a critical role in modern engine control systems, helping vehicles achieve peak performance while staying compliant with stringent emissions standards.
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|---|---|
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Category
This product is cataloged in our store in these categories
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- Exhaust Lambda sensor for cars |
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International
Find this product in one of our international stores
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 69.55 EUR  60.54 EUR  73.40 EUR  79.64 EUR  61.79 EUR |
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Predominant colors of the product |
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| Tags | Conductivity and low |
| Identifiers | |
| Brand |  Denso is a Japanese automotive parts manufacturer. It is the world's largest supplier of automotive ignition systems, and also produces a wide range of other automotive components. |
| Model | Denso DOX-0257 |
| MPN | Denso DOX-0257 |
| ID | 7099788 |
| Dimensions / Weight | |
| Key Features | |
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