Bosch 12201 Oxygen Sensor - Downstream or Upstream

Reliable Oxygen Sensor for Geo and Toyota Vehicles

The Bosch Engineered Oxygen Sensor 12201 is designed specifically for select Geo and Toyota models, including the Celica, Corolla, Paseo, Previa, Prizm, and Tercel. This narrow-band, non-heated oxygen sensor provides accurate emissions monitoring to help maintain engine performance and comply with emission standards.

• Specific fit for Geo and Toyota models: Celica, Corolla, Paseo, Previa, Prizm, Tercel
• Standard replacement grade oxygen sensor with 2-wire configuration
• 21.1-inch wiring harness length with included harness for easy installation
• Blade terminal type with 2 male terminals and rectangular male connector
• Flange mounting type with 18 mm thread diameter and 22 mm hex size
• Durable metal housing finished in steel for long-lasting use
• Narrow-band, non-heated sensor type for precise air-fuel ratio readings

About the Bosch Engineered Oxygen Sensor Line

The Bosch Engineered Oxygen Sensor line focuses on delivering reliable emission control components engineered to meet specific vehicle requirements. The 12201 oxygen sensor is part of this line, offering a precise fit and standard replacement quality for select Geo and Toyota vehicles. Bosch’s engineering ensures compatibility and durability, supporting proper engine management and emission compliance.

Product Details and Specifications

This oxygen sensor features a 21.1-inch wiring harness length and comes with the harness included, facilitating straightforward installation. It uses a flange mounting type with an 18 mm thread diameter and a 22 mm hex size for secure attachment. The sensor has a 2-wire configuration with blade terminals and a rectangular male connector, designed for specific fitment rather than universal application. The sensor housing is made of metal with a steel finish, weighing approximately 0.36 lbs. This narrow-band, non-heated sensor type is suitable for monitoring oxygen levels in the exhaust to optimize fuel mixture and reduce emissions.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for improved engine efficiency
• Helps resolve check engine light triggers related to oxygen sensor faults
• Supports emission system compliance for Geo and Toyota vehicles
• Prevents rough idling and poor fuel economy caused by faulty sensors
• Reduces exhaust emissions by ensuring proper sensor function

Installation Notes and Tips

Ensure the vehicle is cool before installation to avoid burns. Use the 22 mm hex size to remove the old sensor and install the Bosch Engineered Oxygen Sensor 12201 securely with the flange mount. Confirm the wiring harness length of 21.1 inches is sufficient for your vehicle’s routing. The included wiring harness and blade terminals simplify connection, but verify the male connector matches the vehicle’s harness. No mounting bracket is included, so use the existing flange mount on the exhaust system.

Quality Assurance and Warranty

The Bosch Engineered Oxygen Sensor 12201 is manufactured to meet OEM specifications for fit and function. Bosch maintains strict quality control standards to ensure durability and reliable performance. While specific warranty details are not provided here, Bosch typically offers limited warranties on their emission control sensors. Consult Bosch or your parts provider for exact warranty terms.