Bosch 15217 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Wideband Oxygen Sensor for Toyota and Lexus

Bosch Validated Oxygen Sensor 15217 is a specific-fit wideband air-fuel ratio sensor for select Toyota and Lexus applications. It provides the ECU with continuous, high-precision air-fuel ratio data across the full lambda range, helping maintain accurate mixture control in changing load and temperature conditions.

Built with Bosch’s validated wideband sensor design, this replacement is suited for upstream monitoring on vehicles such as the Toyota Camry, Toyota RAV4, Toyota Sienna, Toyota Solara, Toyota Highlander, Lexus RX300, and Lexus ES300. The Bosch Validated Oxygen Sensor line focuses on OE-style fitment and dependable signal response for modern engine management systems.

Key Features

• Wideband A/F oxygen sensor with continuous air-fuel ratio measurement
• Specific-fit design for select Toyota and Lexus upstream applications
• Heated sensor for faster operating temperature and signal readiness
• 4-wire configuration with square male connector and blade terminals
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Wiring harness included; harness length measures 13.5 in
• Metal housing with robust ceramic sensor construction
• Overall length: 16.9 in; sealing surface to connector end: 15.7 in

Detailed Description

Bosch part number 15217 is a wideband oxygen sensor engineered for precise upstream air-fuel ratio feedback. Unlike a traditional switching sensor, this wideband design gives the engine control unit more detailed information, which supports tighter fuel control, stable drivability, and lower emissions under varying operating conditions. Bosch pioneered the planar pump-cell wideband architecture used in modern engine management, and this sensor reflects that OE development background.

This Bosch Validated Oxygen Sensor 15217 is listed for select 1997-2003 Toyota and Lexus models, including applications on the Toyota Camry, Toyota RAV4, Toyota Sienna, Toyota Solara, Toyota Highlander, Lexus RX300, and Lexus ES300. It is a direct replacement for upstream positions where accurate mixture feedback is required, including California-emissions configurations shown in the fitment data.

This part cross-references 8946741011 and 8946741021 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Rough idle or hesitation caused by poor mixture control
• Reduced fuel economy from inaccurate upstream feedback
• Elevated emissions from delayed or unstable sensor response

Installation Notes and Tips

Confirm the upstream position, connector shape, wire count, and thread size before installation. This sensor uses a threaded mount, a square male connector, and a 4-wire harness, so matching the original connector and routing is important for proper installation. Verify the vehicle’s emission configuration, especially on California-emissions applications listed in the fitment data.

For best results, inspect the harness, connector terminals, and exhaust bung threads before installing Bosch 15217. Use the correct oxygen sensor socket and avoid contaminating the sensing element during handling.

Quality Assurance

Bosch backs this sensor with more than five decades of OE development in engine management and emissions control. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accurate signal output, reliable heater performance, and durable operation in demanding thermal cycles.