Bosch 0258006749 - Lambda sensor with vehicle-specific connector

Bosch 0258006749 – Lambda Sensor with Vehicle‑Specific Connector

Overview of the Bosch Lambda Sensor

The Bosch 0258006749, also known as the LS6749 model, is a high‑performance oxygen (O₂) sensor designed to monitor exhaust gases in internal combustion engines. It provides critical data to the engine control unit (ECU), enabling precise fuel injection and emission control. The sensor features a vehicle‑specific connector, ensuring seamless integration with compatible Mercedes‑Benz models, including the A‑Class, B‑Class, C‑Class, E‑Class, CLK, SLK, and others.

Key Technical Specifications

• Model Number: 0258006749 (LS6749)
• Connector Type: Four‑pin vehicle‑specific plug
• Operating Temperature Range: -40 °C to +120 °C
• Signal Output: Voltage signal (0.1 V – 0.9 V) proportional to oxygen concentration
• Response Time: < 100 ms for rapid engine load changes
• Material Construction: Stainless steel housing with ceramic sensor element for durability and corrosion resistance
• Installation Length: Approximately 330 mm, matching OEM specifications

Compatibility and Application

The Bosch 0258006749 is engineered to fit a wide range of Mercedes‑Benz vehicles. It is specifically tailored for models such as:

• A‑Class (W169, W245)
• B‑Class (W245, B‑Sports Tourer)
• C‑Class (W203, W204, CL203, S204)
• E‑Class (W211, W212, R230, W221)
• CLK (C209), SLK (S203), and other luxury variants

Because of its vehicle‑specific connector, the sensor can be installed without additional adapters or modifications. It is suitable for both pre‑Catalytic Converter (pre‑cat) and post‑Catalytic Converter (post‑cat) applications, depending on the engine management strategy.

Performance Benefits

Installing a genuine Bosch 0258006749 sensor delivers several advantages:

• Accurate Air/Fuel Ratio Monitoring: Ensures optimal combustion efficiency and reduces fuel consumption.
• Emission Control Compliance: Helps meet stringent Euro 5/6 regulations by maintaining proper exhaust gas composition.
• Enhanced Engine Longevity: Precise sensor data protects catalytic converters from damage caused by rich or lean mixtures.
• Reliability Under Extreme Conditions: The robust construction withstands high temperatures and harsh automotive environments.

Installation Guide Overview

The installation process for the Bosch 0258006749 is straightforward, thanks to its OEM‑grade connector. Below is a concise step‑by‑step outline:

1. Disconnect Battery: Ensure safety by removing the negative terminal.
2. Locate Existing Sensor: Typically positioned near the exhaust manifold or catalytic converter.
3. Remove Old Sensor: Use a socket wrench to unscrew the old sensor, taking care not to damage the wiring harness.
4. Prepare New Sensor: Apply anti‑seize compound if recommended by Bosch guidelines.
5. Insert and Secure: Thread the new sensor into place until snug, then tighten with a torque wrench to manufacturer specifications.
6. Reconnect Battery and Test: Power on the vehicle and verify that the ECU recognizes the new sensor through diagnostic tools.

Quality Assurance and Certification

The Bosch 0258006749 is manufactured under strict quality control protocols. It complies with OEM standards for Mercedes‑Benz vehicles, ensuring:

• ISO/TS 16949: Automotive industry quality management system.
• CE Marking: Conforms to European safety and environmental regulations.
• Long‑Term Reliability Testing: Subjected to accelerated life cycle tests simulating years of operation.

Maintenance Tips

Although the sensor is designed for durability, periodic checks can extend its lifespan:

• Inspect wiring harnesses for corrosion or damage during routine maintenance.
• Use a diagnostic scan tool to monitor sensor voltage curves; deviations may indicate impending failure.
• Avoid exposure to excessive oil mist or coolant leaks, which can contaminate the sensor element.

Conclusion

The Bosch 0258006749 Lambda Sensor with Vehicle‑Specific Connector is a premium component that delivers reliable performance for Mercedes‑Benz engines. Its precise oxygen measurement capability supports efficient combustion, reduces emissions, and protects critical exhaust components. Whether you are performing an OEM replacement or upgrading your vehicle’s sensor suite, this Bosch model offers unmatched quality and compatibility.

Note: This article focuses exclusively on the product itself, its specifications, applications, and installation guidance, without referencing retail outlets, pricing, or warranty details.