Bosch 13051 Oxygen Sensor - Downstream or Upstream

Bosch 13051 Oxygen Sensor Overview

The Bosch Engineered Oxygen Sensor 13051 is a narrow-band heated O2 sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management across changing engine loads and temperatures.

Compatible With 1998-2002 Chevrolet Prizm upstream and 1998-2002 Toyota Corolla upstream, this Bosch oxygen sensor is also listed for select Toyota 4Runner downstream applications. The Bosch 13051 uses a 4-wire, heated design with a rectangular male connector, blade terminals, and a specific-fit configuration for direct replacement service.

Key Features

• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific-fit design with included wiring harness
• 4-wire configuration with 4 terminals and blade-style terminals
• Rectangular male connector and male terminal gender
• 22 mm hex size and 18 mm thread diameter
• Metal housing with flange mounting type
• Wiring harness length: 12.4 in; overall length: 15.7 in
• Length from sealing surface to connector end: 14.6 in

Product Details

Bosch Engineered Oxygen Sensor 13051 is part of Bosch’s OE-focused oxygen sensor line, which builds on decades of sensor development and narrow-band design refinement. Bosch uses advanced ceramic elements, controlled heater operation, and high-temperature-resistant materials to maintain consistent signal output under heat and vibration. For drivers and technicians servicing Toyota Corolla, Chevrolet Prizm, or Toyota 4Runner emissions systems, this sensor provides the air-fuel feedback needed for accurate engine management.

This part cross-references 94859766 and 8946509200 for the same application.

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel trim conditions caused by inaccurate O2 readings
• Delayed closed-loop operation after startup
• Reduced emissions control performance
• Unstable idle or drivability concerns tied to air-fuel feedback

Installation Notes and Tips

Verify upstream or downstream placement before installation. Confirm the 18 mm thread size, 22 mm hex, and 4-wire connector style match the original sensor on the vehicle. Inspect the harness routing and connector orientation to ensure proper clearance and secure attachment during replacement.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development and supplies aftermarket sensors built to OE-proven standards. The Bosch 13051 is engineered for consistent signal accuracy and durable operation in demanding thermal environments.