Bosch 15922 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Mazda

Bosch Validated Oxygen Sensor 15922 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management for select Mazda applications, including Mazda 3 and Mazda 5 downstream locations.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with rectangular female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for a cleaner replacement setup
• Metal housing and high-temperature-resistant construction
• Overall length: 31.5 in; harness length: 28.1 in

Product Details

Bosch part number 15922 uses a switching-type sensing element to report exhaust oxygen content to the engine control unit. Bosch’s validated oxygen sensor line builds on decades of OE development, including early thimble-style sensors and later planar narrowband designs that improved light-off speed, lambda accuracy, and closed-loop response. For Mazda 3 and Mazda 5 downstream service, this sensor is specified for vehicles without California Emission System on the listed 2004-2007 applications.

This part cross-references Mazda OE numbers L3K218861B and LF6818861D9U for the same application.

Vehicle Fitment

• Fits 2006-2007 Mazda 5, downstream.
• Fits 2004-2005 Mazda 3, downstream; located after secondary converter; without California Emission System.

Common Issues This Sensor Can Address

• Fault codes related to oxygen sensor response or heater circuit performance
• Unstable air-fuel ratio feedback at the downstream sensor location
• Emissions test failures tied to a worn or slow-responding O2 sensor
• Rough combustion control caused by inaccurate exhaust oxygen readings
• Replacement needs after sensor aging, heat cycling, or vibration exposure

Installation Notes and Tips

Confirm the downstream sensor location before ordering, and verify the connector shape, wire count, and thread size against the original part. Inspect the harness routing and exhaust threads before installation, and use proper oxygen sensor service tools to avoid damaging the sensor body or connector. Clear diagnostic trouble codes after installation and verify closed-loop operation during a road test.

Quality Assurance

Bosch backs this oxygen sensor with OE-driven engineering and validated aftermarket application coverage. The design uses ceramic sensing elements, controlled heating, and durable materials selected for high exhaust temperatures and vibration exposure.