Bosch 15571 Oxygen Sensor

Bosch Wideband O2 Sensor for Toyota and Lexus

Bosch Validated Oxygen Sensor 15571 is a wideband air-fuel ratio sensor built for precise mixture feedback in modern engine management systems. It delivers continuous measurement across the full lambda range, helping the ECU maintain accurate control during idle, cruise, and rapid load changes.

Compatible With select Toyota Camry, Toyota Tacoma, Toyota RAV4, Toyota Highlander, Lexus ES350, and related applications listed below, this Bosch oxygen sensor is a direct-fit replacement for upstream locations where accurate air-fuel data matters.

Key Features

• Wideband A/F oxygen sensor for high-precision air-fuel ratio monitoring
• Heated design for faster light-off and stable operation
• Specific-fit replacement with a square connector and 4-wire configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with 9.6 in harness length
• Robust ceramic construction for thermal cycling and load changes
• Bosch Validated Oxygen Sensor line backed by Bosch OE development experience

Product Details

Bosch 15571 uses wideband sensor technology to provide the ECU with more detailed feedback than a traditional switching O2 sensor. That makes it a strong choice for upstream air-fuel control on vehicles such as the Toyota Camry, Toyota Tacoma, and Lexus RX350, where precise mixture correction supports drivability and emissions performance. Bosch pioneered the planar pump-cell wideband design used in modern engine management, and this replacement follows that OE-based approach with a heated, threaded, specific-fit layout.

This part cross-references Toyota/Lexus OE numbers such as 894670E010 and 8946706010 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor or air-fuel ratio sensor faults
• Rough idle or hesitation caused by inaccurate upstream mixture feedback
• Reduced fuel economy from incorrect fuel trim control
• Emissions test failures tied to sensor response or signal accuracy
• Slow sensor reaction during warm-up or rapid throttle changes

Installation Notes

Install Bosch 15571 in the confirmed upstream position for the listed vehicle application. Verify connector shape, thread size, and harness routing before installation. Because this is a wideband sensor, correct placement and secure electrical connection are important for proper ECU feedback. Use the fitment list to confirm whether your vehicle requires upstream right, upstream left, upstream front, or upstream placement.

• Fits 2008-2012 Lexus ES350, Upstream Right
• Fits 2011-2012 Lexus RX350, Upstream Right
• Fits 2008-2012 Toyota Avalon, Upstream Right
• Fits 2009-2012 Toyota RAV4, Upstream
• Fits 2005-2012 Toyota Tacoma, Upstream
• Fits 2009-2012 Toyota Venza, Upstream
• Fits 2008-2011 Toyota Camry, Upstream Right
• Fits 2010-2011 Toyota Camry, Upstream
• Fits 2011 Toyota Sienna, Upstream Right
• Fits 2009-2011 Toyota Venza, Upstream Right
• Fits 2010 Lexus RX350, Upstream Right
• Fits 2010 Lexus RX450h, Upstream Right
• Fits 2010 Toyota 4Runner, Upstream
• Fits 2004-2010 Toyota Highlander, Upstream Left
• Fits 2007-2009 Lexus RX350, Upstream Right, Except Japan Built
• Fits 2007-2009 Lexus RX350, Upstream Left, Japan Built
• Fits 2006-2008 Lexus RX400h, Upstream Left
• Fits 2006-2008 Lexus RX400h, Upstream Right
• Fits 2006-2008 Toyota RAV4, Upstream Right
• Fits 2004-2008 Toyota Solara, Upstream Left
• Fits 2004-2008 Toyota Solara, Upstream Front
• Fits 2004-2007 Toyota Highlander, Upstream Right
• Fits 2004-2006 Lexus ES330, Upstream Left
• Fits 2004-2006 Lexus ES330, Upstream Right
• Fits 2004-2006 Lexus RX330, Upstream Right, North America Built Vehicle
• Fits 2004-2006 Lexus RX330, Upstream Left
• Fits 2004-2006 Lexus RX330, Upstream Right, Japan Built
• Fits 2004-2006 Toyota Camry, Upstream Left
• Fits 2004-2006 Toyota Sienna, Upstream Front
• Fits 2005-2006 Toyota Solara, Upstream Rear, Parts Manufactured in Japan
• Fits 2004-2006 Toyota Solara, Upstream Right, Parts Manufactured in Japan
• Fits 2004 Toyota Solara, Upstream Rear, To 06/2004
• Fits 2004 Toyota Solara, Upstream Rear, From 07/2004, Parts Manufactured in Japan
• Fits 2002-2003 Lexus ES300, Upstream Right
• Fits 2002-2003 Toyota Camry, Upstream Right

Quality Assurance

Bosch supplies this oxygen sensor from its Validated Oxygen Sensor line, drawing on more than five decades of OE development in engine management and emissions control. The design uses a heated wideband sensing element, optimized heater control, and durable construction for consistent signal quality in demanding operating conditions.