Bosch 15414 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Tacoma

Bosch 15414 is a specific-fit, narrow-band heated oxygen sensor built for downstream use on select Toyota Tacoma applications. It provides the ECU with air-fuel-ratio feedback needed for stable combustion control and emissions monitoring.

Key Features

• Specific-fit Bosch Validated Oxygen Sensor for direct application matching
• Narrow-band heated oxygen sensor design for closed-loop fuel control
• 4-wire configuration with blade terminals and rectangular connector
• Flange mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for cleaner replacement routing
• Steel-finish metal housing for high-temperature service
• Fits 2001-2004 Toyota Tacoma, downstream

Product Details

Built on Bosch OE development experience, the 15414 uses a ceramic sensing element and controlled heater strategy to deliver accurate switching-type oxygen readings across changing exhaust temperatures. That helps the engine management system maintain the proper air-fuel ratio during warm-up and normal operation. This part cross-references Toyota applications using OEM numbers 8946509340 and 8946509350 for the same application. For Toyota Tacoma owners searching for a downstream oxygen sensor replacement, Bosch 15414 offers the correct fitment and sensor type for the listed vehicles.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough combustion control caused by aging sensor output

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and downstream location before installation. Use the 22 mm hex size and 18 mm thread specification to confirm removal and installation tool fitment. Inspect the harness routing and exhaust-side connector condition before connecting the new sensor. For 2001-2004 Toyota Tacoma downstream service, match the original mounting style and wiring layout to the vehicle harness.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development, and this Validated Oxygen Sensor line reflects that experience in aftermarket replacement parts. The design uses durable materials and heater control strategies intended to maintain consistent sensor output under heat and vibration.