Bosch 15964 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Wideband O2 Sensor for Subaru and Toyota

Bosch Validated Oxygen Sensor 15964 is a heated wideband air-fuel ratio sensor built for precise upstream mixture monitoring. It provides the ECU with detailed lambda-range feedback for accurate fuel control, stable drivability, and lower emissions in Subaru Legacy, Outback, Tribeca, and select Toyota Camry and Lexus ES300 applications.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design with optimized heater control for faster light-off
• Specific-fit replacement with square connector and 4 blade terminals
• Wiring harness included with 5.8 in harness length
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and robust ceramic construction for thermal durability
• Bosch Validated Oxygen Sensor line backed by OE development experience

Product Details

Bosch part number 15964 is a standard replacement wide band oxygen sensor engineered for upstream locations where the engine management system needs precise feedback under changing load conditions. Bosch pioneered the wideband A/F sensor design used in modern engine control, and this sensor reflects that OE-focused approach with fast response, stable heater performance, and durable construction. It is a direct-fit style sensor for 2010-2014 Subaru Legacy, 2010-2014 Subaru Outback, 2010-2014 Subaru Tribeca, 2008-2009 Subaru Legacy, 2005-2009 Subaru Outback, 2008-2009 Subaru Tribeca, 2006-2007 Subaru B9 Tribeca, 2004-2006 Toyota Camry, 2002-2003 Lexus ES300, and 2002-2003 Toyota Camry in the listed upstream positions. This part cross-references 22641AA25A and 8946706020 for the same application.

Common Uses

• Restoring accurate air-fuel ratio feedback on a Subaru Legacy upstream sensor location
• Replacing a worn upstream oxygen sensor on a Toyota Camry or Lexus ES300
• Addressing lean or rich mixture codes tied to slow sensor response
• Correcting drivability issues caused by inaccurate ECU fuel-trim input
• Replacing a heated wideband sensor with a direct-fit Bosch Validated Oxygen Sensor

Installation Notes

Verify the upstream position, connector shape, terminal count, and thread size before installation. The sensor uses a threaded mount, 18 mm thread diameter, and a square male connector with 4 male blade terminals. Route the included harness away from exhaust heat and inspect the connector and wiring path for damage before final assembly. For best results, confirm the vehicle application against the listed fitment for Bosch 15964 before installation.

Quality Assurance

Bosch draws on more than five decades of OE sensor development, and the Validated Oxygen Sensor line is built to meet the demands of modern engine management systems. Bosch 15964 is engineered for reliable upstream air-fuel measurement in Subaru and Toyota applications where precise sensor feedback matters.