Bosch 13733 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for Precise Fuel Control

Bosch Validated Oxygen Sensor 13733 is a specific-fit wideband air/fuel sensor built for accurate upstream mixture monitoring. It provides the ECU with detailed lambda feedback for cleaner combustion, stable drivability, and consistent engine response.

Compatible With 1997-2004 Toyota Camry and Solara, plus 2001-2004 Subaru Outback upstream applications, this Bosch oxygen sensor is a direct replacement for vehicles that use a wide-band sensor design. The 4-wire heated layout, square male connector, and included wiring harness support OE-style service on the listed applications.

Key Features

• Wide-band oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor activity after startup
• Specific fit with threaded mounting and 18 mm thread diameter
• 4-wire configuration with blade terminals and square male connector
• Overall length of 21.7 in. with 18.2 in. wiring harness length
• Steel finish and metal housing for standard replacement service
• Bosch Validated Oxygen Sensor line for OE-style application coverage

Product Details

Bosch 13733 is engineered as a wideband A/F oxygen sensor for upstream placement, where accurate exhaust feedback is critical to fuel delivery and emissions control. Bosch pioneered the planar pump-cell wideband design used in modern engine management, and this sensor reflects that OE development history with fast light-off, controlled heater operation, and durable ceramic construction. It is a direct-fit replacement for 2000-2002 Toyota Camry upstream, 2003 Toyota Camry upstream without California Emission System, 1997-2000 Toyota Camry upstream with California Emission System, 2002-2003 Toyota Solara upstream, 1999-2001 Toyota Solara upstream with California Emission System, and 2001-2004 Subaru Outback upstream applications.

This part cross-references Toyota 22641AA03C and Toyota 8946733011 for the same application.

What It Helps Address

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

Installation Notes and Tips

Install this sensor in the upstream position only on the listed applications. Confirm connector shape, wire count, thread size, and emission-system notes before replacement, especially on Toyota Camry and Toyota Solara models with California Emission System or without California Emission System distinctions. Use the correct oxygen sensor socket for the 22 mm hex size and verify the harness routing matches the original layout.

Quality Assurance

Bosch backs this Validated Oxygen Sensor line with more than five decades of OE development and aftermarket application experience. The design uses OE-proven engineering principles for accurate signal output, reliable heater control, and durable service in demanding thermal conditions.