Bosch 15846 Oxygen Sensor - Upstream

Bosch Wideband Oxygen Sensor for Jaguar

Bosch Validated Oxygen Sensor 15846 is a direct-fit wideband air-fuel sensor for select Jaguar applications. It provides the ECU with continuous, high-precision air-fuel ratio data across the full lambda range for accurate mixture control, stable drivability, and lower emissions.

Built with Bosch’s planar pump-cell wideband design, this sensor uses fast light-off and optimized heater control to deliver reliable signal response during cold starts, rapid load changes, and high-temperature operation. It is a specific-fit, heated, 4-wire replacement with a square connector and threaded mounting.

Key Features

• Wideband A/F oxygen sensor for precise air-fuel ratio measurement
• Heated design for faster sensor activation
• Specific-fit replacement for select Jaguar S-Type, XJ8, XJR, Vanden Plas, Super V8 applications
• 4-wire configuration with square male connector and female terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for direct replacement use
• Bosch Validated Oxygen Sensor line backed by Bosch OE development experience

Product Details

Bosch part number 15846 is engineered as a standard replacement wide band oxygen sensor for upstream locations on select 2003-2006 Jaguar models. It measures exhaust oxygen content with the precision needed for modern engine management, helping the ECU maintain the correct air-fuel balance under changing load and temperature conditions. This Bosch 15846 sensor cross-references C2C29250 for the same application.

The Bosch Validated Oxygen Sensor line focuses on OE-style fit and signal accuracy for vehicles that rely on wideband feedback. For Jaguar S-Type, XJ8, XJR, Vanden Plas, and Super V8 models, this sensor supports consistent closed-loop control and dependable emissions-system operation.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Rough idle or hesitation caused by poor mixture control
• Reduced fuel economy from inaccurate exhaust feedback
• Emissions test failures tied to sensor response issues

Installation Notes

• Fits 2006 Jaguar S-Type, upstream, to chassis #N52047
• Fits 2003-2005 Jaguar S-Type, upstream
• Fits 2005 Jaguar Super V8, upstream, to chassis #G49700
• Fits 2005 Jaguar Vanden Plas, upstream, to chassis #G49700
• Fits 2005 Jaguar XJ8, upstream, to chassis #G49700
• Fits 2005 Jaguar XJR, upstream, to chassis #G49700
• Fits 2004 Jaguar Vanden Plas, upstream
• Fits 2004 Jaguar XJ8, upstream
• Fits 2004 Jaguar XJR, upstream

Verify connector shape, thread size, and upstream location before installation. Use the existing harness routing and confirm the sensor seats correctly in the threaded bung.

Quality Assurance

Bosch has more than five decades of OE sensor development experience, and this Validated Oxygen Sensor line reflects that background with OE-proven design principles, robust ceramic construction, and application-specific fitment for select Jaguar models.