Bosch 13674 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Downstream Control

Bosch Part Number 13674 is a specific-fit, narrow-band heated oxygen sensor for downstream applications on select Chrysler and Dodge minivans. It provides the ECU with air-fuel-ratio feedback to support stable combustion control and lower emissions during normal driving.

Built under the Bosch Engineered Oxygen Sensor line, this replacement sensor reflects Bosch’s long OE development history in oxygen sensing technology. The design uses a ceramic sensing element, controlled heater operation, and high-temperature materials for consistent signal response in demanding exhaust conditions.

Key Features

• Specific-fit Bosch oxygen sensor for downstream placement
• Narrow-band heated O2 sensor design for closed-loop fuel control
• 4-wire harness with round female connector and pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Standard replacement grade for direct service use
• Wiring harness included for installation on the listed application
• Fits 2001-2003 Chrysler Town & Country, downstream
• Fits 2001-2003 Chrysler Voyager, downstream
• Fits 2001-2003 Dodge Caravan, downstream
• Fits 2001-2003 Dodge Grand Caravan, downstream

Detailed Description

Bosch 13674 is engineered for downstream exhaust monitoring on 2001-2003 Chrysler Town & Country, Chrysler Voyager, Dodge Caravan, and Dodge Grand Caravan models. As a narrow-band heated oxygen sensor, it measures exhaust oxygen content and sends the signal the ECU uses to refine fuel delivery after the catalytic converter. That makes it a direct service part for restoring proper sensor response in vehicles that rely on accurate downstream feedback.

This Bosch Engineered Oxygen Sensor line draws on Bosch’s OE experience, including early thimble-style sensors and later planar narrowband designs that improved light-off speed and closed-loop operation. Bosch Part Number 13674 is built with durable materials to handle heat and vibration in the exhaust stream while maintaining consistent signal output.

This part cross-references 4686935AB for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate oxygen sensor signal response
• Emissions test failures tied to sensor output issues
• Fuel control irregularities caused by a worn sensor
• Exhaust monitoring faults on Chrysler and Dodge minivans

Installation Notes and Tips

Verify the downstream sensor location before installation and match the connector shape, terminal count, and thread size to the original part. Inspect the exhaust bung threads and wiring routing before tightening the sensor to the specified threaded mount. Bosch 13674 uses a 4-wire heated configuration with an 18 mm thread diameter and a round female connector.

Quality Assurance

Bosch oxygen sensors are backed by more than five decades of OE development and are supplied to the aftermarket with OE-proven design principles. Bosch Part Number 13674 is built as a standard replacement sensor for the listed Chrysler and Dodge applications.