Sierra 18-8617 Universal O2 Sensor Wrench Marine Oxygen Sensor Tool

The Sierra 18-8617 O2 Sensor Wrench is a professional-grade oxygen sensor removal and installation tool designed for marine engine applications. Purpose-built for working on fuel-injected marine engines equipped with oxygen sensors, this wrench delivers the access and grip needed to remove and install stubborn O2 sensors in tight exhaust locations.

Key Features:

• Universal design fits standard 7/8" (22 mm) O2 sensors
• Slotted socket design allows sensor wire to pass through without removal or damage
• Compatible with both 6-point and 12-point drive configurations for use in confined spaces
• Durable construction built to withstand the demanding marine environment
• Part of Sierra's comprehensive marine diagnostic and service tool lineup

Designed for professional technicians and serious DIY marine mechanics, the Sierra 18-8617 simplifies oxygen sensor service on fuel-injected outboard and sterndrive engines. Keeping O2 sensors properly serviced helps maintain optimal fuel delivery, combustion efficiency, and engine performance.