Bosch 13470 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Lexus Upstream Applications

Bosch 13470 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 Lexus upstream positions, including 1990-1994 Lexus LS400 and 1992-1995 Lexus SC400.

Key Features

• Specific-fit Bosch Engineered Oxygen Sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• Threaded mounting with 18 mm thread size and 22 mm hex
• 4-wire harness with blade terminals and rectangular connector
• Wiring harness included with 6.9 in harness length
• Steel-finish metal housing for high-temperature service
• Upstream position coverage for Lexus LS400 and Lexus SC400

Product Details

Bosch 13470 uses a switching-type oxygen sensing element to report exhaust oxygen content to the engine control unit, helping maintain stable combustion control and emissions performance. Bosch developed this sensor line from its long-running OE oxygen sensor engineering, including later planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop response. For drivers searching for a Lexus LS400 upstream oxygen sensor or a Lexus SC400 upstream O2 sensor, this part number provides a direct replacement built around the original equipment style.

This part cross-references Bosch 13470 with OE-style applications listed under 8946524050 and 8946550010 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel feedback
• Reduced fuel control from slow sensor response
• Emissions test failures tied to upstream sensor faults
• Closed-loop operation issues on affected Lexus LS400 and SC400 models

Installation Notes

Install Bosch 13470 in the upstream threaded sensor location specified for the vehicle. Confirm the connector shape, 4-wire configuration, and harness length before installation. Use the correct 18 mm oxygen sensor socket and verify the exhaust threads are clean and undamaged before tightening.

Quality Assurance

Bosch backs this oxygen sensor line with more than five decades of OE development and aftermarket supply experience. The sensor uses high-temperature-resistant materials, optimized heater control, and ceramic sensing elements to support consistent operation under thermal and vibration load.