Bosch 13095 Oxygen Sensor - Downstream or Upstream

Bosch Oxygen Sensor for Toyota Applications

Bosch Part Number 13095 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is used on select Toyota 4Runner, Tacoma, T100, and Tundra applications where accurate closed-loop control and stable emissions performance matter.

With a 4-wire layout, rectangular male connector, blade terminals, and included wiring harness, this Bosch Engineered Oxygen Sensor is built for direct replacement service on the listed downstream and upstream positions.

Key Features

• Bosch Engineered Oxygen Sensor, Part Number 13095
• Narrow-band heated oxygen sensor for standard replacement service
• Specific fit for listed Toyota 4Runner, Tacoma, T100, and Tundra applications
• 4-wire design with rectangular male connector and blade terminals
• Wiring harness included for the listed application
• Metal housing with flange mounting
• 22 mm hex size and 18 mm thread diameter
• Length from sealing surface to connector end: 17.5 in

Product Details

Bosch Engineered Oxygen Sensor line draws on Bosch OE development in oxygen sensing technology, including narrow-band switching-type designs that provide the ECU with the signal needed to manage combustion and emissions control. Bosch Part Number 13095 uses a heated sensor element and optimized heater control to improve response during warm-up and maintain stable operation under heat and vibration. This makes it a direct replacement choice for Toyota 4Runner, Tacoma, T100, and Tundra vehicles listed below.

This part cross-references Toyota OE numbers 8946509030 and 8946509050 for the same application.

Vehicle Fitment

• Fits 2001-2004 Toyota Tundra, downstream.
• Fits 1999-2000 Toyota 4Runner, downstream; with California Emission System.
• Fits 1999-2000 Toyota 4Runner, downstream; without California Emission System.
• Fits 2000 Toyota Tacoma, upstream; without California Emission System.
• Fits 2000 Toyota Tacoma, downstream; without California Emission System.
• Fits 2000 Toyota Tundra, upstream; without California Emission System.
• Fits 2000 Toyota Tundra, downstream; with California Emission System.
• Fits 1999 Toyota 4Runner, upstream; to 09/1998; without California Emission System.
• Fits 1996-1999 Toyota 4Runner, downstream.
• Fits 1995-1999 Toyota Tacoma, upstream.
• Fits 1995-1999 Toyota Tacoma, downstream.
• Fits 1999 Toyota Tacoma, upstream; from 10/1998.
• Fits 1996-1998 Toyota 4Runner, upstream.
• Fits 1995-1998 Toyota T100, downstream.

Common Replacement Reasons

• Check engine light related to oxygen sensor performance
• Slow or inaccurate air-fuel ratio feedback to the ECU
• Rough idle or unstable fuel control during closed-loop operation
• Failed emissions inspection tied to sensor response issues
• Heater circuit or sensor signal faults on the listed Toyota applications

Installation Notes and Tips

Confirm the sensor position, connector style, and thread size before installation. This Bosch 13095 uses an 18 mm thread, 22 mm hex, 4-wire harness, and rectangular male connector, so matching the original configuration is important for proper installation on the specified Toyota models.

Inspect the exhaust bung threads and wiring routing before tightening the sensor. Because this is a heated narrow-band oxygen sensor, proper connector engagement and secure harness placement help maintain reliable signal output after replacement.

Quality Assurance

Bosch has decades of OE oxygen sensor development behind this Engineered Oxygen Sensor line, with designs based on proven narrow-band technology used for emissions and fuel-control feedback. Bosch Part Number 13095 is built as a standard replacement sensor for the listed Toyota fitments.