Bosch 15123 Oxygen Sensor - Upstream or Upstream Right

Bosch Validated Oxygen Sensor for OE-Style Control

Bosch Validated Oxygen Sensor 15123 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in demanding thermal and vibration conditions.

Compatible With 2005-2006 Jeep Wrangler, 2005-2006 Jeep TJ, 2006 Dodge Dakota, 2006 Dodge Ram 1500, 2006 Mitsubishi Raider, and 2008-2010 Dodge Viper applications listed below.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for quicker closed-loop operation
• 4-wire configuration with rectangular female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant construction
• Wiring harness included with 15.9 in harness length
• Bosch Validated Oxygen Sensor line backed by Bosch OE development

Product Details

Bosch part number 15123 uses a switching-type narrow-band sensor element to report exhaust oxygen content to the engine control unit. Bosch developed this sensor family from its original oxygen sensor designs and later planar narrowband technology, which improved light-off speed, lambda accuracy, and closed-loop response. For drivers servicing a Dodge Ram 1500, Dodge Dakota, Jeep Wrangler, Jeep TJ, Mitsubishi Raider, or Dodge Viper, this sensor provides the OE-style signal behavior expected by the vehicle calibration.

This part cross-references Mopar 56028995AB for the same application.

What This Sensor Helps Address

• Check engine light caused by oxygen sensor signal faults
• Rough idle or unstable air-fuel control from a worn upstream sensor
• Delayed closed-loop operation after cold start
• Excessive fuel consumption related to inaccurate exhaust feedback
• Emissions test failures tied to sensor response issues

Installation Notes and Tips

Install Bosch 15123 in the listed upstream positions only: upstream, upstream right, or cylinder-specific upstream locations shown in the fitment data. Confirm the 18 mm thread size, 4-wire connector layout, and harness routing before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads, connector condition, and wiring path for heat damage before final tightening.

• Fits 2005-2006 Jeep Wrangler, upstream.
• Fits 2005-2006 Jeep TJ, upstream.
• Fits 2006 Dodge Dakota, upstream right.
• Fits 2006 Dodge Ram 1500, upstream right.
• Fits 2006 Mitsubishi Raider, upstream right.
• Fits 2008-2010 Dodge Viper, upstream.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to the same performance expectations used by vehicle manufacturers. Bosch 15123 is engineered with ceramic sensing elements, controlled heater operation, and durable materials for consistent service in harsh exhaust environments.