Bosch 13139 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Bosch Oxygen Sensor for OE-Style Emissions Control

Bosch Engineered Oxygen Sensor 13139 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management on select Dodge Dakota, Dodge Durango, and Jeep Grand Cherokee applications.

As part of the Bosch Engineered Oxygen Sensor line, this replacement sensor reflects Bosch’s long OE development history, including switching-type and planar narrowband designs that improve light-off response, lambda accuracy, and closed-loop operation. Bosch 13139 uses a threaded metal housing, round female connector, and included wiring harness for a direct-fit service replacement.

Key Features

• Part number 13139 from Bosch Engineered Oxygen Sensor
• Narrow-band heated oxygen sensor for downstream monitoring
• Specific fit replacement with threaded mounting
• 4-wire design with round female connector and pin terminals
• 18 mm thread size and 22 mm hex size
• Wiring harness included for the listed applications
• Steel finish with metal housing for underbody durability

Detailed Description

Bosch 13139 is a standard replacement oxygen sensor engineered for vehicles that rely on downstream O2 feedback to monitor catalyst and exhaust performance. It measures oxygen content in the exhaust stream and sends data to the ECU so the engine management system can maintain proper fuel control. This helps support smoother closed-loop operation and consistent emissions performance across changing load and temperature conditions.

Compatible With 2000 Dodge Dakota, downstream; 2000 Dodge Durango, downstream left; 2000 Dodge Durango, downstream right; 1999-2000 Jeep Grand Cherokee, downstream with California Emission System; and 1999-2000 Jeep Grand Cherokee, downstream without California Emission System. Bosch 13139 is also a direct cross-reference for 56041345AD for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow downstream sensor response
• Emissions test failures tied to sensor degradation
• Rough combustion control caused by inaccurate exhaust readings

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for downstream, downstream left, and downstream right locations depending on vehicle application. Confirm the 18 mm thread size, 22 mm hex size, and 4-wire connector style match the original sensor before installation. Inspect the harness routing and connector condition during replacement to help avoid wiring strain or connection issues.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and materials selected for high-temperature and vibration exposure. The design uses a heated narrow-band sensing element to support faster operation and consistent signal output in the listed applications.