Bosch 13459 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Hyundai

Bosch Validated Oxygen Sensor 13459 is a narrow-band heated downstream O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for select Hyundai Accent, Elantra, and Tiburon applications.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with square female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with 15.2 in harness length
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Bosch Validated Oxygen Sensor line backed by Bosch OE development experience

Product Details

Bosch 13459 uses a switching-type sensing element to measure exhaust oxygen content and send accurate feedback to the engine control unit. The heated narrow-band design helps the sensor reach operating temperature quickly, improving closed-loop response after startup and during changing load conditions. Bosch’s validated oxygen sensor line draws on decades of OE development, including ceramic sensing elements, controlled heater performance, and materials selected for thermal and vibration resistance. This part cross-references Hyundai OE numbers 3921022030 and 3921023030 for the same application.

Vehicle Fitment

• Fits 1997 Hyundai Accent, downstream; to 04/1997; without California Emission System
• Fits 1996-1997 Hyundai Accent, downstream
• Fits 1996-1997 Hyundai Elantra, downstream
• Fits 1997 Hyundai Tiburon, downstream
• Fits 1996 Hyundai Accent, downstream; without California Emission System
• Fits 1995 Hyundai Accent, downstream; from 08/1995; without California Emission System

Common Repair Uses

• Restores accurate downstream oxygen sensor readings
• Addresses check engine light concerns related to O2 sensor performance
• Helps correct rich or lean fuel-control feedback issues
• Supports stable idle and drivability when the original sensor response slows
• Helps maintain emissions system performance on Hyundai Accent, Elantra, and Tiburon models

Installation Notes and Tips

Confirm the downstream location, connector shape, wire count, and thread size before installation. Use the existing threaded mounting point and verify the harness routing keeps the sensor lead away from exhaust heat and moving components. For best results, inspect the exhaust bung threads and connector terminals before replacement, and clear any stored diagnostic trouble codes after installation.

Quality Assurance

Bosch Validated Oxygen Sensor 13459 is part of Bosch’s OE-focused oxygen sensor program, developed from long-term original equipment engineering and validated for aftermarket use.