Bosch 15284 Oxygen Sensor - Downstream or Upstream

Bosch Engineered Oxygen Sensor Overview

Bosch Part Number 15284 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management across changing engine loads, making it a direct replacement choice for vehicles that rely on accurate upstream or downstream O2 sensor input.

The Bosch Engineered Oxygen Sensor line reflects Bosch’s long OE development history, including early thimble-style sensors and later planar narrowband designs that improved response time, lambda accuracy, and closed-loop operation. This sensor uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials for consistent performance in demanding exhaust conditions.

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with rectangular male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for cleaner replacement on the vehicle side
• Standard replacement grade for emission control service
• Compatible with upstream and downstream positions on listed applications

Fitment and Application Details

Compatible with 2003-2006 Chevrolet Suburban 1500, upstream; 2003-2004 Chevrolet Suburban 1500, downstream; 2003-2005 Chevrolet Silverado 1500, upstream; 2003-2004 Chevrolet Silverado 1500, downstream; 2003-2005 Chevrolet Tahoe, upstream; 2003-2004 Chevrolet Tahoe, downstream; and other listed Chevrolet, GMC, Cadillac, Buick, Isuzu applications. Bosch 15284 also matches several 2003-2005 GMC Sierra 1500 and Yukon applications, plus 2004 Cadillac CTS upstream service.

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

What This Sensor Helps Address

• Fault codes related to oxygen sensor response or heater circuit performance
• Rough idle or unstable fuel control caused by inaccurate exhaust feedback
• Increased emissions from delayed or inconsistent air-fuel ratio readings
• Closed-loop operation issues during warm-up and normal driving
• Replacement needs for worn upstream or downstream narrow-band sensors

Installation Notes and Tips

Confirm the sensor position, connector shape, wire count, and thread size before installation. Bosch 15284 uses a threaded mount, 18 mm thread diameter, and a 4-wire heated narrow-band design, so the replacement should match the original sensor configuration on the vehicle. Inspect the harness routing and connector condition before connecting the new sensor, and verify the exhaust threads are clean before tightening.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and materials selected for high exhaust heat and vibration exposure. The Bosch Engineered Oxygen Sensor line is built to deliver consistent signal accuracy and durable service in emission control applications.