Bosch 18273 Oxygen Sensor - Upstream or Upstream Left

Reliable Oxygen Sensor for Cadillac, Chevrolet, and GMC Vehicles

The Bosch OE Quality Oxygen Sensor 18273 is designed to provide precise air-fuel mixture readings for select Cadillac, Chevrolet, and GMC models. This narrow-band heated oxygen sensor ensures accurate emissions control and engine performance for vehicles like the Escalade, Silverado 1500, and Yukon.

• Specific fit for Cadillac Escalade, Chevrolet Silverado 1500, GMC Sierra 1500, and more
• Heated narrow-band oxygen sensor for improved response time
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes 11.2-inch wiring harness with 4 male blade terminals and oblong male connector
• Durable metal housing finished in steel for long-lasting performance
• Overall length of 14.6 inches with 13.4 inches from sealing surface to connector end
• Standard replacement grade for reliable emissions control

About the Bosch OE Quality Oxygen Sensor Line

The OE Quality Oxygen Sensor line by Bosch is engineered to meet original equipment specifications, providing a direct replacement for factory-installed sensors. This product line focuses on delivering consistent sensor performance and durability, ensuring compatibility with specific vehicle models and maintaining proper emissions system function.

Product Details and Specifications

The Bosch part number 18273 is a narrow-band heated oxygen sensor designed for specific fitment on various Cadillac, Chevrolet, and GMC vehicles, including Escalade, Escalade ESV, Express 2500/3500, Savana 2500/3500, Sierra 1500/2500 HD/3500 HD, Silverado 1500/2500 HD, Tahoe, Yukon, and Yukon XL. The sensor features a threaded mounting type with an 18 mm thread diameter and a 22 mm hex size for installation using standard tools. It includes a wiring harness measuring 11.2 inches in length with four wires and blade terminals, connected via an oblong male connector. The sensor housing is made of metal with a steel finish, weighing approximately 0.24 pounds. This heated oxygen sensor helps the engine control module accurately monitor exhaust gases to optimize fuel efficiency and reduce emissions.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for improved engine performance
• Helps resolve check engine light codes related to oxygen sensor failure
• Reduces excessive emissions and helps pass state emissions inspections
• Improves fuel economy by providing precise feedback to the engine control unit
• Prevents rough idling and engine hesitation caused by faulty sensors

Installation Notes and Tips

When installing the Bosch OE Quality Oxygen Sensor 18273, ensure the vehicle is cool to avoid burns. Use a 22 mm oxygen sensor socket or wrench for removal and installation. Verify the sensor’s wiring harness length and connector type match the vehicle’s factory specifications. Avoid over-tightening the sensor to prevent thread damage. This sensor is designed for specific fitment, so confirm compatibility with your Cadillac, Chevrolet, or GMC model before installation.

Quality Assurance and Warranty

Bosch OE Quality Oxygen Sensors are manufactured to meet original equipment standards, ensuring reliable performance and durability. This part is a standard replacement grade sensor designed to maintain proper emissions control. While specific warranty details are not provided here, Bosch products typically come with a limited warranty covering defects in materials and workmanship.