Bosch 13520 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Toyota RAV4

Bosch 13520 is a specific-fit, narrow-band heated oxygen sensor built for downstream use on select Toyota RAV4 models. It provides the ECU with accurate air-fuel-ratio feedback to support stable combustion control and lower emissions under changing driving conditions.

As part of the Bosch Engineered Oxygen Sensor line, this sensor reflects Bosch’s long OE development history in oxygen sensing technology. The design uses a ceramic sensing element, controlled heater operation, and heat-resistant materials to maintain consistent signal quality in demanding exhaust environments.

Key Features

• Part number 13520 Bosch oxygen sensor for downstream applications
• Specific-fit design for select 1998-2000 Toyota RAV4 models
• Narrow-band heated oxygen sensor for closed-loop fuel control
• 4-wire configuration with rectangular male connector
• Blade terminals and included wiring harness for direct replacement use
• Flange mounting style with 18 mm thread diameter and 22 mm hex size
• Metal housing with standard replacement grade construction

Detailed Description

Bosch 13520 is engineered for vehicles that rely on a downstream oxygen sensor to monitor exhaust oxygen content after the catalytic converter. On 1998-2000 Toyota RAV4 applications, this sensor helps the ECU maintain proper mixture control by delivering precise switching-type O2 feedback during normal operation. The Bosch Engineered Oxygen Sensor line is based on Bosch’s original oxygen sensor development and later planar narrowband designs, which improved response time and closed-loop operation compared with earlier sensor styles.

This Bosch 13520 sensor is a practical choice for Toyota RAV4 owners addressing drivability or emissions-related sensor replacement needs. It is also referenced by part number 8946549065 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow or unstable closed-loop fuel control
• Emissions test failures tied to oxygen sensor output
• Rough combustion control caused by a worn narrow-band sensor

Installation Notes

Fits 1998-2000 Toyota RAV4, downstream. Confirm connector shape, wire count, thread size, and mounting style before installation. The sensor uses a 4-wire harness, a rectangular male connector, and an 18 mm thread diameter. Use the correct oxygen sensor socket or 22 mm hex tool during removal and installation, and verify the exhaust system is cool before service.

Quality Assurance

Bosch backs this oxygen sensor with OE-focused engineering and more than five decades of oxygen sensor development. The Bosch Engineered Oxygen Sensor line is built to deliver consistent signal accuracy and durable operation in high-temperature, high-vibration exhaust conditions.