How to Replace Oxygen Sensor 15510 in Mitsubishi Downstream Location OE?

If you own a Mitsubishi and are experiencing issues with your vehicle’s fuel efficiency or emissions, it may be time to replace the oxygen sensor 15510. The oxygen sensor is a vital component in your car’s engine management system, responsible for monitoring the amount of oxygen in the exhaust gases and adjusting the fuel-to-air ratio accordingly. Over time, the sensor can become damaged or worn out, leading to a decrease in performance and an increase in harmful emissions.

In this guide, we will walk you through the steps necessary to replace the oxygen sensor 15510 in your Mitsubishi downstream location OE. We will also provide helpful tips and tricks to ensure a successful installation.

Step 1: Locate the Oxygen Sensor

The oxygen sensor is typically located in the exhaust system, downstream of the catalytic converter. In most Mitsubishi models, the sensor can be found near the rear of the vehicle, underneath the car. Consult your owner’s manual or a repair manual for your specific make and model to locate the sensor.

Step 2: Prepare for Replacement

Before replacing the oxygen sensor, make sure your vehicle is turned off and the engine is cool. You will also need to gather the necessary tools and equipment, including a wrench or socket set, a wire brush, and a can of penetrating oil.

Step 3: Remove the Old Sensor

Using a wrench or socket set, loosen and remove the old oxygen sensor from its mounting location. If the sensor is stuck or difficult to remove, use a wire brush to clean any rust or debris from the mounting threads. Apply penetrating oil to the threads and let it sit for a few minutes before attempting to remove the sensor again.

Step 4: Install the New Sensor

Once you have removed the old oxygen sensor, it’s time to install the new one. Carefully screw the new sensor into place, making sure not to cross-thread it. Tighten the sensor until it is snug, but be careful not to overtighten it as this can damage the threads.

Step 5: Test the Sensor

After installing the new oxygen sensor, start your vehicle and let it run for a few minutes. Use a diagnostic tool or scan tool to check for any error codes related to the oxygen sensor. If there are no error codes, take your car for a test drive to ensure that everything is working properly.


Replacing the oxygen sensor 15510 in your Mitsubishi downstream location OE is a simple task that can improve your vehicle’s performance and reduce harmful emissions. By following these steps and using caution during installation, you can ensure a successful replacement that will keep your car running smoothly for years to come. Remember to consult your owner’s manual or a repair manual for your specific make and model for additional guidance.