Bosch 13598 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 13598

Bosch 13598 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for specific upstream applications, including Mitsubishi Eclipse, Plymouth Laser, Hyundai Elantra, Hyundai Sonata, Mitsubishi Galant, Dodge Colt, and Mitsubishi Mirage.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Threaded, specific-fit design with 18 mm thread diameter
• 4-wire configuration with round male connector and female terminals
• Wiring harness included; harness length measures 23.3 in
• Metal housing with threaded mounting and 22 mm hex size
• Overall length: 27 in; sealing surface to connector end: 29.9 in

Product Details

Bosch 13598 uses advanced ceramic sensing elements, optimized heater control, and high-temperature-resistant materials to maintain consistent signal output under thermal and vibration load. As part of Bosch’s Actual OE Oxygen Sensor line, this sensor reflects the company’s long OE development history and narrowband sensor engineering for accurate feedback in everyday driving and emissions-critical operation. This part number, 13598, is a direct replacement style sensor for upstream locations on the listed vehicles.

This part cross-references Mitsubishi OE applications such as 3921033010 and MD136308 for the same application.

Vehicle Fitment

• Fits 1990-1994 Mitsubishi Eclipse, Upstream. Bosch Engineered Oxygen Sensor.
• Fits 1990-1994 Plymouth Laser, Upstream. Bosch Engineered Oxygen Sensor.
• Fits 1993 Hyundai Elantra, Upstream. To 06/1993; Actual OE Oxygen Sensor.
• Fits 1992-1993 Hyundai Sonata, Upstream. Actual OE Oxygen Sensor.
• Fits 1992 Hyundai Elantra, Upstream. Actual OE Oxygen Sensor.
• Fits 1991-1992 Mitsubishi Galant, Upstream. Actual OE Oxygen Sensor.
• Fits 1989-1992 Mitsubishi Galant, Upstream. Bosch Engineered Oxygen Sensor.
• Fits 1989 Dodge Colt, Upstream. Bosch Engineered Oxygen Sensor.
• Fits 1989 Mitsubishi Mirage, Upstream. Bosch Engineered Oxygen Sensor.

Installation Notes

Confirm the upstream sensor location, connector shape, wire count, and thread size before installation. Bosch 13598 uses an 18 mm threaded mount and a round connector, so matching the original harness and sensor style is important for proper fitment on Mitsubishi Eclipse, Plymouth Laser, and the other listed applications. Inspect the exhaust bung threads and wiring routing before tightening the sensor into place.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The Actual OE Oxygen Sensor line is built to deliver OE-proven fit, signal accuracy, and durability for aftermarket replacement use.