Bosch 15215 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Toyota

The Bosch Validated Oxygen Sensor 15215 is a specific-fit, heated narrow-band O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in select Toyota applications, including the 2001-2003 Toyota Prius downstream and 1998-1999 Toyota Avalon downstream.

Key Features

• Bosch Validated Oxygen Sensor line with OE-focused development
• Heated narrow-band sensor for faster closed-loop operation
• Specific fit with threaded mounting and 18 mm thread diameter
• 4-wire design with blade terminals and rectangular connector
• Wiring harness included; harness length measures 12.6 in
• Overall length: 16.3 in; sealing surface to connector end: 15.2 in
• Steel finish with metal housing for high-temperature service
• Part number 15215 for direct identification

Product Details

Bosch has decades of oxygen sensor development behind this replacement part, starting with early OE sensor designs and advancing to planar narrow-band technology for quicker light-off and more accurate lambda control. The Bosch Validated Oxygen Sensor 15215 uses a heated narrow-band sensing element and optimized heater control to deliver consistent signal response under thermal cycling and vibration. This makes it a practical replacement for downstream sensor service on the Toyota Prius and Toyota Avalon listed below. This part number 15215 is also referenced in aftermarket lookup systems for straightforward catalog matching.

This part cross-references 8946507010 and 8946547060 for the same application.

Vehicle Fitment

• Fits 2001-2003 Toyota Prius, downstream.
• Fits 1998-1999 Toyota Avalon, downstream.

What It Helps Address

• Faulty oxygen sensor signal or slow sensor response
• Check engine light related to downstream O2 sensor performance
• Unstable fuel control caused by inaccurate exhaust oxygen readings
• Emissions test failures tied to sensor degradation
• Rough combustion control from a worn heated narrow-band sensor

Installation Notes

Confirm the downstream location, 18 mm thread size, 22 mm hex, and 4-wire connector style before installation. Inspect the harness routing and connector condition, and verify the sealing surface is clean before threading the sensor into place. Use the vehicle’s service procedure for torque and connector handling to avoid damage to the sensor or exhaust bung.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and validated aftermarket coverage. The sensor uses high-temperature-resistant materials, ceramic sensing elements, and heater control strategies developed for consistent operation in demanding exhaust conditions.