Bosch 13340 Oxygen Sensor - Downstream, Downstream Left or Upstream

Bosch Oxygen Sensor for Toyota Applications

Bosch Engineered Oxygen Sensor 13340 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in Toyota Tacoma, Tundra, Sequoia, and Pickup applications with the listed downstream and upstream positions.

Key Features

• Bosch Engineered Oxygen Sensor line with OE-focused design and calibration
• Narrow-band heated oxygen sensor for faster closed-loop operation
• Specific-fit replacement with 4-wire harness and rectangle male connector
• Flange mounting, 18 mm thread size, and 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Wiring harness included for direct replacement on listed applications

Product Details

Bosch part number 13340 uses advanced ceramic sensing elements and optimized heater control to deliver consistent signal response across changing exhaust temperatures. As part of the Bosch Engineered Oxygen Sensor line, it reflects Bosch’s long OE development history in switching-type oxygen sensor technology, including narrowband designs that improve light-off speed and closed-loop readiness. This sensor is a direct replacement for Toyota Tacoma, Toyota Tundra, Toyota Sequoia, and Toyota Pickup applications listed below, including downstream and upstream positions where specified. This part cross-references Bosch-style OE applications such as 8946509110 and 8946509300 for the same application.

What It Helps Address

• Check engine light caused by oxygen sensor signal faults
• Rough idle or unstable air-fuel control from a worn sensor
• Delayed closed-loop operation after cold start
• Increased exhaust emissions from inaccurate lambda feedback
• Fuel trim issues related to slow or inconsistent sensor response

Installation Notes

• Verify the exact position before ordering: downstream, downstream left, or upstream.
• Confirm the vehicle is listed for the correct Toyota Tacoma, Tundra, Sequoia, or Pickup year and emission configuration.
• Inspect the connector shape, terminal count, and harness routing before installation.
• Use the correct 18 mm oxygen sensor socket or 22 mm hex tool for removal and installation.
• Clear diagnostic trouble codes and confirm sensor operation after installation.

Quality Assurance

Bosch supplies oxygen sensors backed by more than five decades of OE development and aftermarket engineering. Bosch 13340 is built to OE-proven standards for signal accuracy, heater performance, and durability under heat and vibration.

Compatible With

• Fits 2001-2004 Toyota Sequoia, downstream
• Fits 2003-2004 Toyota Tundra, downstream left
• Fits 2000 Toyota Tacoma, downstream, without California Emission System
• Fits 1999-2000 Toyota Tacoma, upstream
• Fits 2000 Toyota Tundra, downstream, without California Emission System
• Fits 1999 Toyota Tacoma, downstream
• Fits 1993-1995 Toyota Pickup, downstream, Short Bed; USA Built; with California Emission System
• Fits 1993-1995 Toyota Pickup, downstream, USA Built; with California Emission System
• Fits 1994-1995 Toyota Pickup, downstream, with California Emission System