Bosch 13198 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Toyota Upstream Applications

Bosch 13198 is a specific-fit, narrow-band heated oxygen sensor built for upstream air-fuel monitoring in select Toyota vehicles. It uses a 4-wire, blade-terminal design with a rectangular male connector and included wiring harness for direct replacement service.

Key Features

• Specific-fit Bosch Engineered Oxygen Sensor for targeted Toyota applications
• Narrow-band heated O2 sensor for closed-loop fuel control
• 4-wire configuration with blade terminals and rectangular male connector
• Flange mounting, 18 mm thread size, and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included; harness length measures 12 in
• Overall length: 15.7 in; sealing surface to connector end: 14.6 in

Product Details

Bosch Engineered Oxygen Sensor 13198 is part of Bosch’s long-running oxygen sensor line, developed from OE engineering experience dating back to the original Bosch thimble sensor and later planar narrowband designs. This sensor provides precise air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions during normal driving and warm-up operation. It is a heated narrow-band sensor with a standard replacement grade and a specific fit for upstream locations on select Toyota T100, Toyota 4Runner, Toyota Pickup, and Toyota Celica models.

This part cross-references Bosch Engineered Oxygen Sensor applications such as 8946529545 and 8946539435 for the same vehicle coverage. Bosch 13198 is a direct-fit service part for Toyota upstream oxygen sensor replacement where accurate lambda feedback is required.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or unstable air-fuel control
• Excess fuel consumption caused by inaccurate exhaust feedback
• Failed emissions inspection tied to upstream sensor faults
• Slow closed-loop response after startup or during warm operation

Installation Notes and Fitment

Compatible With 1992-1997 Toyota T100, upstream; 1993-1995 Toyota 4Runner, upstream; 1992-1995 Toyota Pickup, upstream; and 1992-1993 Toyota Celica, upstream. Fitment also includes Toyota Pickup configurations with California Emission System, Japan Built, Long Bed, and Dual Rear Wheels where listed in the application data. Verify connector style, thread size, and upstream location before installation. Use proper oxygen sensor service tools to avoid damaging the sensor or exhaust bung threads.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and this 13198 sensor uses ceramic sensing elements, controlled heater operation, and heat-resistant materials for consistent performance under thermal and vibration load. It is engineered to deliver OE-proven replacement quality for the listed Toyota applications.