Bosch 15898 Oxygen Sensor - Downstream, Upstream or Upstream Right

Bosch 15898 Oxygen Sensor Overview

Bosch Engineered Oxygen Sensor 15898 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-fit choice for select Chevrolet, GMC, Cadillac, Saturn, Pontiac, Oldsmobile, Isuzu, and Hummer applications.

With a threaded mounting design, 4-wire blade terminal connection, and included wiring harness, this Bosch oxygen sensor is built for specific-fit replacement service. It is a practical option for drivers searching for a downstream oxygen sensor for 2007 Chevrolet Silverado 1500, an upstream oxygen sensor for 2005-2007 Chevrolet Cobalt, or a replacement O2 sensor for 2006-2007 GMC Yukon applications.

Key Features

• Bosch Engineered Oxygen Sensor line with OE-focused design and calibration
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific-fit replacement with 4-wire blade terminals and square connector
• Threaded 18 mm mounting with 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Wiring harness included for direct replacement service
• Fits downstream and upstream positions across listed applications

Product Line Details

Bosch Engineered Oxygen Sensor products build on Bosch’s long history in oxygen-sensing technology, including early thimble-style designs and later planar narrowband sensors. That development focus is reflected in faster sensor response, improved lambda accuracy, and quicker transition into closed-loop operation. Part number 15898 follows that OE-oriented approach for drivers who need a replacement oxygen sensor with stable signal output and consistent heater control.

Fitment and Application

• Fits 2007 Cadillac Escalade, downstream
• Fits 2007 Cadillac Escalade ESV, downstream
• Fits 2007 Cadillac Escalade EXT, downstream
• Fits 2007 Chevrolet Avalanche, downstream
• Fits 2005-2007 Chevrolet Cobalt, upstream
• Fits 2006-2007 Chevrolet Silverado 1500, downstream
• Fits 2007 Chevrolet Silverado 1500 Classic, downstream
• Fits 2007 Chevrolet Suburban 1500, downstream
• Fits 2007 Chevrolet Suburban 2500, downstream
• Fits 2006-2007 Chevrolet Tahoe, downstream
• Fits 2006-2007 GMC Sierra 1500, downstream
• Fits 2007 GMC Sierra 1500 Classic, downstream
• Fits 2006-2007 GMC Yukon, downstream
• Fits 2007 GMC Yukon XL 1500, downstream
• Fits 2007 GMC Yukon XL 2500, downstream
• Fits 2007 Hummer H2, downstream
• Fits 2003-2007 Saturn Ion, upstream
• Fits 2006 Cadillac CTS, downstream
• Fits 2003-2005 Chevrolet Astro, downstream
• Fits 2003-2005 Chevrolet Astro, upstream right
• Fits 2002-2005 Chevrolet Cavalier, upstream
• Fits 2004-2005 Chevrolet Classic, upstream
• Fits 2003-2005 GMC Safari, downstream
• Fits 2003-2005 GMC Safari, upstream right
• Fits 2002-2005 Pontiac Grand Am, upstream
• Fits 2002-2005 Pontiac Sunfire, upstream
• Fits 2002-2005 Saturn Vue, upstream
• Fits 2002-2004 Oldsmobile Alero, upstream
• Fits 2004 Saturn L300, upstream
• Fits 2002-2003 Chevrolet Trailblazer, upstream
• Fits 2002-2003 Chevrolet Trailblazer EXT, upstream
• Fits 2002-2003 GMC Envoy, upstream
• Fits 2002-2003 GMC Envoy XL, upstream
• Fits 2003 Isuzu Ascender, upstream
• Fits 2002-2003 Oldsmobile Bravada, upstream
• Fits 2002-2003 Saturn L200, upstream
• Fits 2002-2003 Saturn LW200, upstream
• Fits 2002 Saturn L100, upstream

What It Helps Address

• Check engine light related to oxygen sensor signal faults
• Rough idle or unstable air-fuel control from a worn O2 sensor
• Reduced fuel control accuracy during closed-loop operation
• Emissions test failures tied to sensor response or heater issues
• Delayed sensor switching caused by age, heat, or contamination

Installation Notes and Tips

Confirm the sensor position before ordering, since Bosch 15898 is listed for both upstream and downstream applications depending on vehicle. Verify the 18 mm thread size, 4-wire connector style, and harness routing against the original sensor before installation. For best results, inspect the exhaust threads and connector condition, and clear diagnostic trouble codes after replacement if required by the vehicle.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in air-fuel sensing technology. The design uses advanced ceramic elements, controlled heater operation, and heat-resistant materials to maintain consistent performance under thermal and vibration stress.

This part cross-references GM Genuine Parts 12568234 and 12577588 for the same application.