Bosch 15514 Oxygen Sensor

Bosch Oxygen Sensor for Mitsubishi Applications

Bosch Engineered Oxygen Sensor 15514 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, making it a direct-fit replacement for select Mitsubishi, Chrysler, and Dodge applications.

With a threaded mounting design, square male connector, 4-wire harness, and included wiring harness, this Bosch oxygen sensor is built for specific-fit service on upstream positions. It is a practical replacement for Mitsubishi Eclipse, Endeavor, Galant, Lancer, and Diamante applications where accurate closed-loop operation matters.

Key Features

• Bosch Engineered Oxygen Sensor, part number 15514
• Narrow-band heated oxygen sensor for upstream air-fuel feedback
• Specific-fit design with 4-wire configuration
• Square male connector with blade terminals
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included
• Overall length: 15.7 in; harness length: 12 in

Product Details

Bosch has decades of OE oxygen sensor development behind this design, including early thimble-style sensors and later planar narrowband technology. That engineering background is reflected in the sensor’s fast light-off behavior, accurate lambda feedback, and reliable closed-loop response. Bosch 15514 is built to deliver consistent signal output under heat and vibration, which is important for vehicles that rely on precise upstream sensor data to manage fuel delivery and emissions.

This part cross-references Mitsubishi MD354850 and MD357284 for the same application. It is a direct replacement choice for Mitsubishi Eclipse, Mitsubishi Endeavor, and Mitsubishi Galant service where the original upstream sensor has aged or failed.

What It Helps Fix

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel ratio feedback
• Fuel trim issues from slow or unstable upstream sensor response
• Emissions test failures tied to a worn narrow-band O2 sensor
• Poor closed-loop fuel control during warm operation

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream left, upstream front, upstream right, and upstream rear applications depending on vehicle and engine configuration. Confirm the connector shape, wire count, and threaded mounting style match the original sensor on your Mitsubishi Eclipse, Endeavor, Galant, Lancer, Diamante, Sebring, or Stratus application.

For best results, inspect the harness routing and connector condition before installation. Use the correct oxygen sensor socket for the 18 mm hex, and ensure the threads seat cleanly in the exhaust bung to avoid cross-threading.

Quality Assurance

Bosch supplies this oxygen sensor as a standard replacement part backed by more than five decades of OE development in emissions control sensing. The design uses advanced ceramic elements, controlled heater operation, and durable materials selected for demanding exhaust environments.