Bosch 0258003671 - Lambda sensor with vehicle-specific connector

BOSCH 0258003671 – Precision Lambda Sensor with Vehicle‑Specific Connector

The BOSCH 0258003671, also known as the LS3671 Oxygen O² Exhaust Probe, is a high‑performance lambda sensor engineered for front‑of‑catalyst installation in a wide range of CITROËN and PEUGEOT models. Its design incorporates a vehicle‑specific connector that ensures seamless integration with the engine control unit (ECU), delivering accurate air–fuel mixture monitoring essential for optimal combustion, emissions compliance, and fuel economy.

Key Functional Characteristics

• Four‑Pole Construction: The sensor features a four‑pole output that provides precise voltage signals to the ECU, enabling real‑time adjustments of the fuel injection system.
• High Temperature Resistance: Built to withstand exhaust temperatures up to 800 °C, the LS3671 maintains signal integrity even under prolonged engine operation.
• Rapid Response Time: With a response time of less than 0.5 seconds, the sensor quickly detects changes in oxygen concentration, allowing the ECU to react instantly for optimal combustion.
• Robust Connector Design: The vehicle‑specific connector eliminates the need for adapters or additional wiring harnesses, reducing installation complexity and potential points of failure.

Compatibility Spectrum

The BOSCH 0258003671 is tailored to fit a variety of front‑of‑catalyst positions in the following models:

• CITROËN Saxo, Xsara, ZX/Break, Partner I, Combispace
• PEUGEOT 206, 106 I, 1.6L variants
• Additional compatibility with other European compact cars that share the same exhaust layout and ECU architecture.

Its universal applicability across these platforms makes it a preferred choice for both OEM replacements and aftermarket upgrades.

Installation & Maintenance Guidelines

1. Preparation: Ensure the engine is cool before removing the existing sensor. Disconnect the battery to prevent accidental ECU resets.
2. Removal: Use a suitable lambda sensor wrench to unscrew the old probe. Carefully detach the vehicle‑specific connector, noting its orientation.
3. Installation: Align the new LS3671 with the exhaust pipe and torque it to the manufacturer’s specification (typically 10–12 Nm). Reconnect the connector, ensuring a snug fit.
4. Verification: After re‑connecting the battery, start the engine and allow it to reach operating temperature. Use an OBD-II scanner to confirm that the sensor is reporting correct voltage ranges (typically 0.1 V to 0.9 V).

Routine checks every 20,000–30,000 miles are recommended to detect any drift in sensor output, which could indicate wear or contamination.

Performance Benefits

• Enhanced Fuel Efficiency: Accurate air‑fuel ratio monitoring reduces fuel consumption by up to 5% compared to generic sensors.
• Lower Emissions: Precise oxygen measurement ensures the catalytic converter operates within its optimal range, cutting NOx and CO emissions.
• Improved Engine Longevity: By preventing rich or lean running conditions, the sensor protects catalytic converters and downstream components from damage.

Technical Specifications

Why Choose the BOSCH LS3671?

The combination of a vehicle‑specific connector, proven durability, and precise signal output makes the BOSCH 0258003671 an industry standard for front‑catalyst lambda sensing. Whether you’re restoring a classic Peugeot or maintaining a modern Citroën, this sensor delivers reliable performance that aligns with OEM expectations.

Conclusion

For drivers and technicians seeking uncompromised accuracy in air‑fuel management, the BOSCH 0258003671 Lambda Sensor stands out as a top-tier solution. Its thoughtful engineering ensures that every breath of exhaust gas is measured with precision, safeguarding engine health while promoting environmental responsibility.