Bosch 15974 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Wideband Oxygen Sensor for OE-Style Control

Bosch Validated Oxygen Sensor 15974 is a specific-fit wideband air-fuel ratio sensor built for precise upstream monitoring. It delivers continuous measurement across the full lambda range, helping the engine control module manage fuel delivery with the detail needed for stable performance and lower emissions.

Compatible With select Lexus and Toyota applications, including Lexus GX460, LC500, RC F, and Toyota 4Runner, Sequoia, and Tundra upstream positions. Bosch 15974 is engineered as a standard replacement for vehicles that require a wideband A/F sensor with a 4-wire heated design.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor activity after startup
• Specific fit with included wiring harness for direct replacement
• 4-wire, blade-terminal construction with rectangle male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust metal housing and ceramic sensor construction for thermal durability
• Overall length: 15.9 in; sealing surface to connector end: 14.8 in

Product Details

Bosch Validated Oxygen Sensor 15974 uses Bosch wideband technology to provide the ECU with more detailed feedback than a traditional switching O2 sensor. That added precision supports accurate mixture control during idle, cruise, acceleration, and load changes. Bosch pioneered the planar pump-cell wideband design, and this sensor line reflects that OE development history in a service replacement format.

This part cross-references Toyota and Lexus OE numbers such as 894670C030 and 894670C060 for the same application.

What It Helps Address

• Check engine light concerns related to upstream air-fuel sensor performance
• Rough idle or inconsistent fuel trim readings
• Reduced fuel economy caused by inaccurate mixture feedback
• Emissions test failures tied to sensor response or signal quality
• Driveability issues during rapid throttle changes or thermal cycling

Installation Notes

Install in the upstream left or upstream position only where listed in the fitment data. Verify connector shape, wire count, thread size, and sensor length before installation. Because some Toyota and Lexus applications vary by build date, confirm the exact year, model, and position match before replacing the original sensor.

Fits 2022-2025 Lexus IS500, Upstream Left; 2021-2025 Lexus LC500, Upstream Left; 2021-2025 Lexus RC F, Upstream Left; 2021-2024 Toyota 4Runner, Upstream Left; 2021-2023 Lexus GX460, Upstream; 2021-2022 Toyota Sequoia, Upstream Left; 2021 Toyota Tundra, Upstream Left; 2016-2020 Lexus GS F, Upstream Right and Upstream Left; 2016-2020 Lexus GX460, Upstream; 2018-2020 Lexus LC500, Upstream Left; 2015-2020 Lexus RC F, Upstream Right and Upstream Left; 2015-2020 Toyota 4Runner, Upstream Right and Upstream Left; 2010-2020 Toyota Sequoia, Upstream Left; 2014-2020 Toyota Sequoia, Upstream Right; 2010-2020 Toyota Tundra, Upstream Left; 2014-2020 Toyota Tundra, Upstream Right; 2010-2012 Toyota Tundra, Upstream Right; 2005-2019 Toyota Tundra, Upstream; 2015-2018 Lexus GS450h, Upstream Left; 2007-2011 Lexus GS450h, Upstream Left and Upstream Right; 2006-2018 Toyota Yaris, Upstream; 2014-2017 Lexus LS460, Upstream; 2013-2016 Toyota Land Cruiser, Upstream; 2013-2015 Lexus LS600h, Upstream; 2013-2015 Lexus LX570, Upstream; 2012-2015 Toyota Tacoma, Upstream; 2005-2008 Toyota Tacoma, Upstream; 2015 Toyota Tundra, Upstream Right; 2008-2014 Lexus IS F, Upstream; 2014 Toyota 4Runner, Upstream Left and Upstream Right; 2013 Lexus GX460, Upstream; 2013 Lexus LS460, Upstream; 2007-2013 Lexus LS460, Upstream Left; 2013 Toyota Sequoia, Upstream Right; 2013 Toyota Tundra, Upstream Right; 2010-2012 Lexus HS250h, Upstream; 2009-2012 Lexus IS250, Upstream Left; 2009-2012 Lexus IS350, Upstream Left; 2007-2012 Lexus LS460, Upstream Right; 2008-2012 Lexus LS600h, Upstream Right and Upstream Left; 2010-2012 Toyota 4Runner, Upstream; 2009-2012 Toyota FJ Cruiser, Upstream; 2008-2012 Toyota Sequoia, Upstream; 2009-2011 Lexus GS350, Upstream Left; 2008-2011 Lexus GS460, Upstream Left; 2008-2011 Lexus LX570, Upstream; 2008-2011 Toyota Land Cruiser, Upstream; 2011 Toyota Prius, Upstream; 2009-2011 Toyota Tacoma, Upstream Left and Upstream Right; 2005-2010 Pontiac Vibe, Upstream; 2009-2010 Toyota Corolla, Upstream; 2005 Toyota Corolla, Upstream; 2008-2010 Toyota Highlander, Upstream Left; 2004-2010 Toyota Matrix, Upstream; 2004-2010 Toyota Prius, Upstream; 2005-2009 Lexus GX470, Upstream; 2008-2009 Scion xD, Upstream; 2005-2009 Toyota 4Runner, Upstream; 2008 Lexus GS350, Upstream and Upstream Left and Upstream Right; 2008 Lexus IS250, Upstream Left and Upstream Right and Upstream; 2008 Lexus IS350, Upstream; 2006-2008 Toyota Corolla, Upstream; 2008 Toyota FJ Cruiser, Upstream; 2007 Lexus GS350, Upstream and Upstream Left and Upstream Right; 2006-2007 Lexus IS250, Upstream and Upstream Right and Upstream Left; 2006-2007 Lexus IS350, Upstream; 2006-2007 Lexus LX470, Upstream Left and Upstream Right; 2007 Toyota 4Runner, Upstream; 2006-2007 Toyota Corolla, Upstream; 2007 Toyota FJ Cruiser, Upstream; 2006-2007 Toyota Land Cruiser, Upstream Left and Upstream Right; 2005-2007 Toyota Sequoia, Upstream; 2006 Lexus GS300, Upstream and Upstream Left and Upstream Right; 2005 Lexus LX470, Upstream Right and Upstream Left; 2005 Toyota Land Cruiser, Upstream Right and Upstream Left; 2001-2003 Toyota Highlander, Upstream.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience and validated aftermarket coverage for modern Toyota and Lexus engine management systems.