BOSCH 0258017038 

Oxygen Sensor (Lambda Sensor) 

Technical Data

Product Information

The Oxygen Sensor (Lambda Sensor) is a vital emissions control component. Positioned before the catalytic converter (upstream), this regulating sensor measures the amount of unburned oxygen in the exhaust gases . This specific BOSCH unit features advanced LSU-4.9 wideband technology with 5 circuits, allowing the Engine Control Unit (ECU) to precisely and continuously adjust the air-fuel ratio for optimal combustion efficiency . Featuring an overall length of 340 mm and an extended recommended change interval of 250,000 km, it is engineered for extreme durability and accuracy . It serves as a direct OE replacement for specific BMW and Steyr applications .

About the Manufacturer: BOSCH is the original inventor of the Lambda sensor and remains the undisputed global leader in engine management and emissions technology. As the premier Original Equipment Manufacturer (OEM) for automakers worldwide, BOSCH oxygen sensors guarantee exact fitment, unmatched reliability, and superior response times to help engines run cleaner and more efficiently .

• ✔ Genuine BOSCH LSU-4.9 wideband technology ensures highly accurate, continuous air-fuel mixture regulation .
• ✔ Upstream regulating sensor (5 circuits, 340 mm length) designed for fitment before the catalytic converter .
• ✔ Exact replacement for OEM part numbers including BMW 11787537984 .

Cross Reference

Fully interchangeable with OEM/OE parts:

⚠ Diagnostic & Installation Tip ⚠

Before replacing the oxygen sensor:

• Check the exhaust system for leaks upstream of the sensor. Exhaust leaks can draw in outside air, skewing the sensor's readings and triggering false lean mixture codes .
• BOSCH oxygen sensors often come with threads pre-coated with anti-seize compound. If applying additional anti-seize, ensure it never touches the sensor tip or slots, as this will permanently ruin the sensor element .
• Always route the 340 mm sensor cable carefully, keeping it away from extreme heat sources like the exhaust manifold to prevent melting and short circuits .

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