Bosch 15273 Oxygen Sensor - Downstream

Bosch Oxygen Sensor 15273 Overview

Bosch Engineered Oxygen Sensor 15273 is a specific-fit, narrow-band heated O2 sensor built for downstream applications. It provides air-fuel-ratio feedback to the ECU for stable combustion control and emissions monitoring on select Toyota and Pontiac models.

Compatible With 2000-2006 Toyota Echo, Toyota Matrix, and Pontiac Vibe downstream applications, Bosch 15273 uses a threaded mounting design, 4-wire harness, and a rectangular male connector for OE-style replacement fitment.

Key Features

• Specific-fit Bosch oxygen sensor for downstream placement
• Narrow-band heated sensor design for closed-loop fuel control
• 4-wire configuration with included wiring harness
• Blade terminals, 4 terminal count, male connector and terminal gender
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Overall length: 20.3 in; harness length: 16.9 in

Product Details

Bosch Engineered Oxygen Sensor 15273 is part of Bosch’s oxygen sensor line developed from decades of OE engineering experience. The Bosch oxygen sensor product line includes switching-type and planar narrowband designs that focus on faster sensor response, accurate lambda feedback, and reliable closed-loop operation. This part number, 15273, is a standard replacement sensor for downstream monitoring on the listed Toyota Echo, Toyota Matrix, and Pontiac Vibe applications.

This part cross-references Monroe Shocks & Struts (e.g., 88971387, 8946501090) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings sent to the ECU
• Rough idle or unstable combustion control from a worn downstream sensor
• Emissions test failures tied to sensor response issues
• Delayed closed-loop fuel control after sensor aging or contamination

Installation Notes

Install Bosch 15273 in the threaded downstream location specified by the vehicle application. Verify connector shape, terminal count, wire length, and thread size before installation. Use proper oxygen sensor service tools and follow factory torque specifications to avoid damage to the sensor or exhaust bung.

Fits 2000-2002 Toyota Echo, downstream. Fits 2003-2006 Toyota Matrix, downstream. Fits 2003-2006 Pontiac Vibe, downstream.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The sensor uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials to support consistent operation under thermal and vibration load.