Bosch 17404 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for BMW Models

The Bosch Actual OE Oxygen Sensor 17404 is designed to provide accurate air-fuel mixture readings for optimal engine performance. This heated, wide-band oxygen sensor is compatible with various BMW models, ensuring precise emission control and efficient fuel management.

• Heated oxygen sensor for faster response times
• Specific fit for BMW 340i, 440i, 540i, 740i, M240i, X3, X4, and related models
• 5-wire design with blade terminals and oblong male connector
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Durable metal housing with steel finish and 11.6-inch wiring harness length
• Wide-band sensor type for accurate air-fuel ratio measurement
• Wiring harness included for direct replacement

About the Bosch Actual OE Oxygen Sensor Line

The Bosch Actual OE Oxygen Sensor product line focuses on delivering standard replacement sensors that meet original equipment specifications. This ensures compatibility and reliable performance for emission control systems in specific vehicle applications. The 17404 sensor maintains Bosch's commitment to quality and precision in emission sensor technology.

Detailed Product Description

This Bosch oxygen sensor features a heated element to reduce warm-up time, allowing the sensor to reach operating temperature quickly for accurate readings. The wide-band sensor type provides a broad measurement range, improving engine control and emissions management. With a 5-wire configuration and blade terminal type, the sensor offers secure electrical connections. The oblong male connector and included wiring harness simplify installation on compatible BMW models. The sensor’s metal housing and steel finish provide durability under harsh engine conditions. Threaded mounting with an 18 mm diameter and 22 mm hex size ensures a precise fit and easy replacement.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for BMW 340i, 440i, 540i, 740i, M240i, X3, and X4 models
• Resolves engine performance issues related to faulty oxygen sensors
• Helps correct poor fuel economy caused by incorrect air-fuel mixture readings
• Reduces emissions by ensuring proper catalytic converter function
• Eliminates check engine light triggers related to oxygen sensor faults

Installation Notes and Tips

Ensure the engine is cool before removing the old oxygen sensor to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the sensor’s wiring harness length and connector type match the vehicle’s specifications. Avoid damaging the sensor’s wiring during installation. Do not overtighten; torque to manufacturer specifications for the 18 mm threaded sensor.

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet strict quality standards and original equipment specifications. The Actual OE Oxygen Sensor 17404 undergoes rigorous testing to ensure durability and reliable performance. While specific warranty details are not provided here, Bosch typically offers coverage consistent with industry standards for emission control components.