Bosch 15211 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Toyota Tacoma

Bosch 15211 is a specific-fit, narrow-band heated oxygen sensor for the downstream position on the 2000 Toyota Tacoma with California Emission System. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated sensor design for faster closed-loop response
• 4-wire configuration with rectangular male connector
• Blade terminals and 18 mm thread size
• Flange mounting style with metal housing
• Wiring harness included with 28.9 in harness length
• Overall length: 32.2 in; sealing surface to connector end: 31.1 in
• 22 mm hex size for service removal

Product Details

Bosch Validated Oxygen Sensor 15211 is built as a standard replacement sensor for emissions control service. Bosch’s oxygen sensor development includes decades of OE engineering, from early thimble-style sensors to planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop operation. For the 2000 Toyota Tacoma downstream location, this sensor supports accurate exhaust feedback under normal driving and thermal load conditions.

This part cross-references 8946509260 for the same application. Bosch 15211 is a direct service option for Toyota Tacoma owners addressing downstream sensor replacement needs on California Emission System vehicles.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback to the engine control unit
• Emissions test failures tied to sensor response issues
• Rough or unstable closed-loop fuel control
• Sensor degradation from heat and vibration exposure

Installation Notes and Tips

Verify the downstream sensor location before installation and confirm the connector shape, wire count, and thread size match the original unit. Use the correct 22 mm oxygen sensor socket or wrench, and inspect the exhaust bung threads before tightening. Because this is a specific-fit sensor for the 2000 Toyota Tacoma with California Emission System, confirm vehicle emission configuration and connector routing before service.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and validated aftermarket application coverage. The sensor uses high-temperature-resistant materials, optimized heater control, and ceramic sensing elements to maintain consistent signal output in demanding exhaust conditions.