Bosch 13231 Oxygen Sensor - Upstream

Overview of Bosch Actual OE Oxygen Sensor 13231

The Bosch Actual OE Oxygen Sensor 13231 is designed specifically for select BMW models, including the 318i, 325i, 530i, and M3. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data to the vehicle's engine management system.

• Compatible with BMW models such as 318i, 318is, 325i, 530i, 740i, and M3
• Heated narrow-band oxygen sensor for improved response time
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes a 4-wire harness with a female round connector
• Overall length of 22.4 inches with an 18.7-inch wiring harness
• Constructed with durable metal housing finished in steel
• Standard replacement grade for reliable emissions control

Detailed Product Description

The Bosch Actual OE Oxygen Sensor 13231 is engineered as a specific fit replacement part for various BMW vehicles, including the 318ti, 325is, 540i, 740iL, 850CSi, and others. This sensor features a narrow-band heated design, which allows it to reach operating temperature quickly, providing accurate oxygen level readings to the engine control unit. The sensor’s metal housing and threaded mounting ensure a secure and durable installation. The 4-wire configuration with a female round connector and pin terminal type supports reliable electrical connections. With an overall length of 22.4 inches and a wiring harness length of 18.7 inches, this sensor is designed to fit precisely without modification.

Applications and Common Issues Addressed

• Restores proper air-fuel ratio monitoring for BMW 318i and 325i models
• Resolves engine performance issues related to faulty oxygen sensors
• Helps reduce emissions and pass state inspections
• Eliminates rough idling and poor fuel economy caused by sensor failure
• Prevents check engine light triggers related to oxygen sensor faults

Installation Notes and Tips

• Ensure the vehicle is cool before removing the old sensor to avoid burns
• Use a 22 mm oxygen sensor socket for removal and installation
• Do not overtighten; torque to manufacturer specifications for the 18 mm thread
• Verify connector compatibility with the female round connector and 4-wire harness
• Inspect wiring harness for damage before installation

Quality Assurance and Warranty

The Bosch Actual OE Oxygen Sensor 13231 is manufactured to meet OEM specifications for fit, form, and function. Bosch’s standard replacement grade ensures consistent performance and durability. This oxygen sensor is backed by Bosch’s quality standards, providing confidence in its reliability for emissions control and engine management. Warranty details should be confirmed with the point of purchase or Bosch directly.

About Bosch Actual OE Oxygen Sensor Product Line

The Bosch Actual OE Oxygen Sensor product line is designed to provide direct-fit replacement sensors that meet original equipment specifications. This line focuses on delivering precise sensor performance and durability for specific vehicle applications. The 13231 sensor exemplifies this approach by offering a heated narrow-band sensor tailored for BMW models, ensuring compatibility and reliable emissions monitoring without the need for modifications.