Bosch 15498 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for 2004 Chrysler Pacifica

Bosch Validated Oxygen Sensor 15498 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It is listed for the downstream position on the 2004 Chrysler Pacifica and uses a threaded mounting design with a 4-wire harness for direct replacement service.

Key Features

• Specific-fit oxygen sensor for the downstream location
• Narrow-band heated sensor type for closed-loop fuel control
• 4-wire design with included wiring harness
• Rectangle female connector with pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and steel finish for underbody service conditions
• Wiring harness length: 24.2 in; overall length: 28 in

Product Details

Bosch Validated Oxygen Sensor 15498 is part of Bosch’s oxygen sensor line developed from decades of OE engineering experience. Bosch introduced the original thimble-style O2 sensor in 1976 and later advanced planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop response. This sensor uses a heated narrow-band design with optimized heater control and high-temperature-resistant materials to maintain stable signal output under thermal and vibration load. For a 2004 Chrysler Pacifica downstream oxygen sensor replacement, Bosch 15498 provides the signal quality needed for accurate fuel trim control and emissions monitoring.

This part cross-references 4727936AD for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect air-fuel ratio feedback to the ECU
• Slow or unstable closed-loop fuel control
• Emissions test failures tied to sensor performance
• Signal degradation from heat, vibration, or age

Installation Notes and Tips

Verify the downstream location before installation on the 2004 Chrysler Pacifica. Match the connector shape, terminal count, thread size, and harness length to the original sensor before removal. Use proper oxygen sensor service tools for the 22 mm hex and 18 mm threaded mounting, and inspect the exhaust bung threads for damage or contamination before installing Bosch 15498.

Quality Assurance

Bosch backs this oxygen sensor line with more than five decades of OE development and aftermarket application experience. Bosch Validated Oxygen Sensor 15498 is built to OE-proven standards for accurate signal delivery and durable operation in demanding exhaust environments.