Bosch 13249 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Civic Downstream Service

Bosch 13249 is a specific-fit, narrow-band heated oxygen sensor for downstream service on select Honda Civic applications. It delivers air-fuel-ratio feedback to the ECU to support stable combustion control and lower emissions, with OE-style construction for dependable replacement performance.

Key Features

• Specific-fit Bosch Engineered Oxygen Sensor for direct application matching
• Narrow-band heated oxygen sensor design for closed-loop fuel control
• Rectangle connector with 4 blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included with 16.7 in harness length
• Overall length: 19.7 in; sealing surface to connector end: 18.5 in

Product Details

Bosch 13249 is part of the Bosch Engineered Oxygen Sensor line, a product family built on decades of OE development in oxygen sensing technology. Bosch moved from early thimble-style sensors to planar narrowband designs that improve light-off response, lambda accuracy, and closed-loop operation. This sensor uses advanced ceramic elements and optimized heater control to maintain consistent signal quality under heat and vibration. Fits 1998-2000 Honda Civic, downstream. This part cross-references Monroe Shocks & Struts (e.g., 36532PDNA01) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough combustion control during closed-loop operation
• Elevated emissions from a worn downstream sensor
• Delayed sensor response after warm-up

Installation Notes and Tips

Verify the downstream location, connector shape, terminal count, and thread size before installation. Use the existing threaded bung and confirm the 18 mm thread diameter and 22 mm hex size match the vehicle application. Inspect the harness routing and connector lock before final connection. Fits 1998-2000 Honda Civic, downstream.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE sensor development and aftermarket supply experience. The design reflects Bosch’s OE-proven approach to durability, heater control, and signal accuracy for emission-control service.