Bosch 12108 Oxygen Sensor - Downstream or Upstream

Reliable Oxygen Sensor for Geo and Toyota Vehicles

The Bosch Engineered Oxygen Sensor 12108 is designed specifically for select Geo and Toyota models, including the Celica, Corolla, Paseo, Prizm, RAV4, and Tercel. This narrow-band, non-heated oxygen sensor provides accurate emissions data to help maintain optimal engine performance and fuel efficiency.

• Specific fit for Geo and Toyota models: Celica, Corolla, Paseo, Prizm, RAV4, Tercel
• Standard replacement narrow-band oxygen sensor
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• 13.6-inch wiring harness length with included harness and 2-wire blade terminals
• Durable metal housing with steel finish and male rectangular connector

About the Bosch Engineered Oxygen Sensor Line

The Bosch Engineered Oxygen Sensor line focuses on delivering precise emissions control components tailored to specific vehicle applications. The 12108 oxygen sensor is part of this line, engineered to meet OEM specifications for fit and function. Its design ensures reliable sensor readings for emission systems in Geo and Toyota vehicles, supporting compliance with environmental standards.

Product Details and Specifications

This Bosch oxygen sensor features a narrow-band sensor type that is non-heated, suitable for vehicles that do not require heated sensors. The sensor includes a 13.6-inch wiring harness with a 2-wire blade terminal configuration and a male rectangular connector, ensuring proper electrical connection. The sensor mounts via a threaded design with an 18 mm thread diameter and a 22 mm hex size for installation using standard tools. The metal housing with a steel finish provides durability under engine bay conditions. Overall length measures 17.3 inches, with 16.1 inches from the sealing surface to the end of the connector.

Common Applications and Issues Addressed

• Replacement for faulty or failing oxygen sensors in Geo and Toyota Celica, Corolla, Paseo, Prizm, RAV4, and Tercel models
• Helps resolve engine performance issues related to incorrect air-fuel mixture readings
• Assists in reducing emissions and maintaining compliance with environmental regulations
• Addresses check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency by providing accurate oxygen level data to the engine control unit

Installation Notes and Tips

Installation requires removal of the old oxygen sensor and threading the Bosch 12108 sensor into the exhaust manifold or pipe. Use a 22 mm oxygen sensor socket or wrench for proper tightening. Ensure the wiring harness is connected securely to the vehicle’s harness using the male rectangular connector. Avoid over-tightening to prevent damage to the sensor or exhaust components. This sensor does not include a mounting bracket and is designed for specific vehicle fitment, so verify compatibility before installation.

Quality Assurance and Warranty

The Bosch Engineered Oxygen Sensor 12108 is manufactured to meet strict quality standards for emissions control sensors. It is constructed with durable metal housing and reliable electrical connectors to ensure long service life. While specific warranty details are not provided here, Bosch typically offers limited warranties on their emission control parts. Refer to Bosch or authorized distributors for warranty information related to this oxygen sensor.