Bosch 12040 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for Volkswagen Golf and Jetta

The Bosch 12040 Actual OE Oxygen Sensor is designed specifically for Volkswagen Golf and Jetta models. This narrow-band, non-heated oxygen sensor ensures accurate emission control and optimal engine performance by monitoring exhaust gases precisely.

• Specific fit for Volkswagen Golf and Jetta
• Narrow-band non-heated oxygen sensor type
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 16.4-inch wiring harness length with included harness
• Blade terminal type with 2 male terminals and rectangular male connector
• Standard replacement grade with metal housing and steel finish
• Overall length of 20.1 inches for proper fitment

About the Bosch Actual OE Oxygen Sensor Line

The Bosch Actual OE Oxygen Sensor line is engineered to meet original equipment specifications, providing reliable performance and durability. This product line focuses on delivering precise sensor readings to maintain proper air-fuel mixture and reduce emissions, making it a suitable replacement for Volkswagen vehicles requiring exact fit and function.

Product Details and Specifications

The Bosch 12040 oxygen sensor features a narrow-band sensor type that is non-heated, designed for specific Volkswagen Golf and Jetta models. It includes a 16.4-inch wiring harness and a rectangular male connector with blade terminals, ensuring secure electrical connections. The sensor mounts via a threaded design with an 18 mm thread diameter and a 22 mm hex size for installation using standard tools. Constructed with a metal housing and finished in steel, this sensor weighs approximately 0.22 pounds and measures 20.1 inches in overall length, including an 18.9-inch length from the sealing surface to the end of the connector.

Common Issues Addressed by This Oxygen Sensor

• Incorrect air-fuel mixture readings causing poor fuel economy
• Check engine light triggered by faulty oxygen sensor signals
• Increased vehicle emissions failing emissions tests
• Engine performance issues such as rough idling or hesitation
• Malfunctioning sensor affecting catalytic converter efficiency

Installation Notes and Tips

When installing the Bosch 12040 oxygen sensor, ensure the vehicle is compatible with this specific part number and model fitment for Volkswagen Golf and Jetta. Use a 22 mm wrench or oxygen sensor socket to remove and install the sensor securely. Avoid over-tightening the threaded sensor to prevent damage. Confirm the wiring harness is properly connected to the vehicle’s electrical system, matching the blade terminal and rectangular male connector for a secure fit.

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet strict quality standards, ensuring reliable operation and durability. The Actual OE Oxygen Sensor line is designed to match original equipment specifications for Volkswagen vehicles. While specific warranty details are not provided here, Bosch typically offers coverage against manufacturing defects, supporting long-term performance and customer confidence.