Bosch 15506 Oxygen Sensor - Downstream or Downstream Right

Bosch Validated Oxygen Sensor for OE-Style Control

Bosch Validated Oxygen Sensor 15506 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management across changing engine loads, making it a direct replacement choice for select Dodge and Jeep applications.

With Bosch Validated Oxygen Sensor engineering, this part uses a threaded mounting design, a 4-wire harness, and a rectangular female connector for specific-fit service. The Bosch 15506 is a standard replacement sensor with OE-proven design principles carried over from Bosch oxygen sensor development.

Key Features

• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific-fit replacement with 4-wire harness included
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Rectangular female connector with pin terminals
• Metal housing for high-temperature and vibration resistance
• Overall length: 13.2 in; wiring harness length: 9.5 in
• Standard replacement grade for direct service use

Product Details

Bosch 15506 is engineered as a switching-type narrow-band oxygen sensor that reports exhaust oxygen content to the engine control unit. Bosch’s oxygen sensor line evolved from early OE sensor designs to planar narrowband technology, improving light-off response, lambda accuracy, and closed-loop operation. This sensor is built with a heated ceramic element and high-temperature-resistant materials to maintain consistent signal output in demanding thermal conditions.

Compatible With select 2004-2006 Dodge Ram 1500, 2004 Dodge Dakota, 2004 Dodge Durango, 2005 Dodge Durango, 2004 Jeep Liberty, 2004 Jeep TJ, and 2004 Jeep Wrangler applications. This part cross-references Mopar 56028996AA for the same application. Bosch 15506 is a practical OE-style service part for drivers replacing a worn upstream or downstream sensor on supported Dodge Ram 1500 and Jeep models.

Common Issues This Sensor Can Help Address

• Check engine light related to oxygen sensor performance
• Rough idle or unstable air-fuel control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Failed emissions inspection tied to sensor response issues
• Delayed closed-loop operation after startup

Installation Notes and Tips

Verify connector shape, wire count, thread size, and sensor position before installation. This Bosch 15506 uses a threaded mount and a 4-wire configuration, so it should be matched to the original sensor layout on the vehicle. Inspect the exhaust bung threads and connector condition before installing the new sensor, and route the harness away from heat sources and moving components.

For fitment-specific service, use the vehicle position listed for your application: Fits 2004-2006 Dodge Ram 1500, Downstream Right; Fits 2004 Dodge Ram 1500, Downstream; Fits 2005 Dodge Durango, Upstream; Fits 2004 Dodge Dakota, Downstream Right; Fits 2004 Dodge Durango, Downstream Right; Fits 2004 Jeep Liberty, Downstream; Fits 2004 Jeep TJ, Downstream; Fits 2004 Jeep Wrangler, Downstream.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this product line. The Bosch Validated Oxygen Sensor range is built to OE-proven standards for accurate signal delivery, durable construction, and dependable service in emissions control applications.