Bosch 12054 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for Ford, Mazda, and Mercury Vehicles

The Bosch Engineered Oxygen Sensor 12054 is designed to provide accurate air-fuel mixture readings for specific Ford, Mazda, and Mercury models. This narrow-band, non-heated oxygen sensor ensures proper emission control and engine performance by delivering precise data to your vehicle's engine management system.

• Specific fit for Ford, Mazda, and Mercury models including 323, 626, B2600, Capri, Festiva, MX-6, Probe, RX-7, and Tracer
• Standard replacement grade for reliable performance
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size for secure installation
• 19.5-inch wiring harness length with a single blade terminal and square male connector
• Constructed with durable metal housing and steel finish for longevity
• Narrow-band, non-heated sensor type suitable for emission control systems

About the Bosch Engineered Oxygen Sensor Line

The Bosch Engineered Oxygen Sensor line focuses on delivering precise and reliable sensors tailored to specific vehicle applications. The 12054 part number is part of this line, offering a standard replacement oxygen sensor designed to meet OEM specifications for emission control. This ensures compatibility and consistent performance in Ford, Mazda, and Mercury vehicles requiring a narrow-band sensor without heating elements.

Product Details and Specifications

This Bosch oxygen sensor features a 19.5-inch wiring harness with one wire and a blade terminal type, connected via a square-shaped male connector. The sensor is threaded with an 18 mm diameter and 22 mm hex size, allowing for straightforward installation into the exhaust system. The overall length of the sensor is 23.2 inches, with 22 inches measured from the sealing surface to the end of the connector. The sensor is constructed from metal with a steel finish, weighing approximately 0.176 pounds. It is a narrow-band, non-heated oxygen sensor designed for specific vehicle fitment rather than universal application.

Common Applications and Issues Addressed

• Helps maintain optimal air-fuel ratio for efficient engine operation
• Reduces harmful emissions by providing accurate oxygen level data
• Prevents engine performance issues related to faulty oxygen sensors
• Addresses check engine light triggers caused by sensor failure
• Improves fuel economy by ensuring proper combustion control

Installation Notes and Tips

When installing the Bosch Engineered Oxygen Sensor 12054, ensure the sensor threads match the 18 mm diameter and use a 22 mm wrench for tightening. The sensor’s specific fitment requires matching the part to compatible Ford, Mazda, or Mercury models listed. Avoid overtightening to prevent damage to the sensor or exhaust manifold. The wiring harness and connector are designed for direct replacement, so verify connector compatibility before installation.

Quality Assurance and Warranty

Bosch Engineered Oxygen Sensors are manufactured to meet strict quality standards, ensuring reliable performance and durability. This part is a standard replacement grade sensor designed to meet OEM specifications. Warranty details should be confirmed with the point of purchase or Bosch directly, as they may vary by region and distributor.