Bosch 13704 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Honda Accord

Bosch Engineered Oxygen Sensor Part Number 13704 is a specific-fit, downstream narrow-band heated oxygen sensor for select Honda Accord applications. It delivers air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.

Built with Bosch’s OE development experience, this sensor uses a ceramic sensing element, optimized heater control, and high-temperature-resistant materials for consistent signal response in demanding exhaust conditions. It is a direct replacement for downstream service on 2003-2007 Honda Accord models listed below.

Key Features

• Specific-fit Bosch Engineered Oxygen Sensor, Part Number 13704
• Narrow-band heated oxygen sensor with 4-wire configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Rectangle connector with male connector and female terminals
• Wiring harness included for direct replacement service
• Steel finish and metal housing for exhaust-system durability
• Downstream position coverage for select Honda Accord applications

Detailed Description

Bosch 13704 is a switching-type oxygen sensor that measures exhaust oxygen content and sends the signal to the ECU for fuel-trim correction. For Honda Accord owners, this downstream sensor supports accurate emissions feedback on 2004-2007 Accord models without California Emission System and on 2003 USA-built Accord applications. Bosch’s narrow-band design is engineered for fast light-off and reliable closed-loop operation once the exhaust reaches operating temperature.

Bosch Engineered Oxygen Sensor products draw on decades of OE sensor development, and this part follows that approach with a heated design, durable materials, and a harnessed connector layout for service replacement. This part number 13704 is also referenced in OE-style interchange listings for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback affecting fuel control
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough or unstable combustion control caused by inaccurate exhaust readings

Installation Notes and Tips

Compatible With 2004-2007 Honda Accord, downstream, without California Emission System, and 2003 Honda Accord, downstream, USA Built. Verify connector shape, thread size, and sensor position before installation. Use the correct oxygen sensor socket for the 22 mm hex and confirm the exhaust threads are clean before threading the sensor into place.

Quality Assurance

Bosch backs this oxygen sensor with OE-focused engineering and long-term experience supplying sensors to vehicle manufacturers. The design uses high-temperature-resistant construction and heater control intended to maintain stable sensor operation under exhaust heat and vibration.