Bosch 15309 Oxygen Sensor - Downstream or Upstream

Bosch Oxygen Sensor for Toyota and Pontiac

Bosch Part Number 15309 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for select Toyota Tacoma, Toyota Matrix, and Pontiac Vibe applications, with OE-style connector and threaded mounting for direct service replacement.

Key Features

• Bosch Engineered Oxygen Sensor line with OE development background
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific fit with 4-wire harness and rectangular male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included for application-specific installation
• Overall length: 19.7 in; sealing surface to connector end: 18.5 in

Product Details

Bosch 15309 is engineered as a standard replacement oxygen sensor that measures exhaust oxygen content and sends accurate feedback to the engine control unit. Bosch’s oxygen sensor program evolved from its original sensor design introduced in 1976 and later incorporated planar narrowband technology for faster light-off, improved lambda accuracy, and quicker closed-loop operation. For Toyota Tacoma downstream service and Toyota Matrix or Pontiac Vibe upstream service, this sensor supports stable combustion control and emissions management across changing operating conditions.

This part cross-references Bosch Engineered Oxygen Sensor applications using OE-style replacement references for the same vehicle coverage. Bosch 15309 is a practical choice when replacing a worn Toyota Tacoma oxygen sensor or servicing a Toyota Matrix or Pontiac Vibe upstream sensor location.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel trim conditions caused by inaccurate exhaust feedback
• Slow closed-loop response during warm-up or steady cruising
• Emissions test failures tied to sensor degradation
• Rough combustion control from a tired narrow-band sensor

Installation Notes and Tips

Verify the sensor position before ordering: this part is listed for 2021-2023 Toyota Tacoma downstream, 2016-2020 Toyota Tacoma downstream, 2003-2006 Pontiac Vibe upstream, and 2003-2006 Toyota Matrix upstream. Confirm the 4-wire connector, threaded mount, and 18 mm thread size match the original sensor. Use proper oxygen sensor service tools and inspect the harness routing to avoid heat damage after installation.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development and supplies aftermarket sensors built to OE-proven standards for accuracy, durability, and thermal resistance.