Bosch 15408 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Honda and Acura

Bosch Validated Oxygen Sensor 15408 is a specific-fit, narrow-band heated O2 sensor built for downstream air-fuel monitoring. It delivers the signal the ECU uses to maintain closed-loop control, support stable combustion, and manage emissions on select Honda Civic and Acura RSX applications.

Built with a threaded 18 mm mount, 4-wire blade terminals, and a rectangular female connector, this Bosch oxygen sensor is a direct replacement for vehicles that require OE-style fitment and reliable heater performance. Bosch 15408 is a practical choice for drivers addressing a failed downstream sensor on a 2001-2005 Honda Civic or 2005-2006 Acura RSX.

Key Features

• Bosch Validated Oxygen Sensor, part number 15408
• Narrow-band heated oxygen sensor for downstream use
• Specific fit with 4-wire, blade-terminal configuration
• Threaded 18 mm mounting with 22 mm hex size
• Rectangular female connector with included wiring harness
• Steel-finish metal housing for standard replacement service
• Fits 2005-2006 Acura RSX, downstream
• Fits 2001-2005 Honda Civic, downstream, located after secondary converter

Product Details

Bosch 15408 uses Bosch’s long-running oxygen sensor development experience, including narrow-band switching technology and heated ceramic sensing elements, to provide accurate exhaust feedback under normal driving and warm-up conditions. The heater circuit helps the sensor reach operating temperature faster, which supports quicker closed-loop operation after startup. For shoppers searching for a downstream oxygen sensor for Honda Civic or Acura RSX, this Bosch Validated Oxygen Sensor offers OE-proven design cues in a standard replacement format.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback after the secondary converter
• Rough or unstable closed-loop fuel control
• Failed heater circuit or slow sensor warm-up
• Emissions test failure tied to oxygen sensor readings

Installation Notes and Tips

Verify connector shape, wire count, thread size, and downstream location before installation. Bosch 15408 is a threaded sensor with an 18 mm thread diameter and 22 mm hex size, so proper removal tools help prevent damage during service. Confirm the vehicle application by year, make, model, and position: 2005-2006 Acura RSX, downstream, and 2001-2005 Honda Civic, downstream, located after secondary converter.

Quality Assurance

Bosch supplies oxygen sensors backed by decades of OE development and validated aftermarket coverage. Bosch 15408 is built to the same OE-focused standards that support accurate exhaust measurement and dependable operation in demanding thermal and vibration conditions.