01 Honda CR-V LX replacement 250-24105 upstream downstream oxygen sensor method

Welcome to my automotive blog, where we delve into the world of Honda CR-V LX, specifically focusing on the replacement method for the 250-24105 upstream downstream oxygen sensors. These vital components play a crucial role in ensuring optimal engine performance and emissions control. In this article, we will explore the step-by-step process of replacing these sensors, providing you with the necessary knowledge to maintain and enhance your 2001 Honda CR-V LX’s performance.

Understanding the Importance of Oxygen Sensors in 01 Honda CR-V LX

Before delving into the replacement procedure, it is essential to grasp the significance of oxygen sensors in your 2001 Honda CR-V LX. These sensors monitor the oxygen content in the exhaust gases and relay crucial data to the engine control unit (ECU). The ECU then adjusts the air-fuel mixture to achieve the perfect balance for efficient combustion and lower emissions.

The 250-24105 upstream sensor is situated before the catalytic converter, measuring the oxygen levels in the exhaust gases leaving the engine. On the other hand, the downstream sensor, also known as the post-catalytic converter sensor, analyzes the exhaust gases after they pass through the catalytic converter.

In total, your Honda CR-V LX has two oxygen sensors – one upstream and one downstream. Regular maintenance and timely replacement of these sensors are vital to ensure your vehicle’s engine operates at its peak performance and adheres to environmental regulations.

Step-by-Step Guide to Replacing 250-24105 Upstream Downstream Oxygen Sensors

Now that we understand the role of oxygen sensors, let’s proceed with the replacement process. Follow these steps carefully to ensure a successful replacement:

Step 1: Safety First

Before beginning any automotive maintenance task, safety should be your top priority. Park your Honda CR-V LX on a level surface, engage the parking brake, and wear appropriate protective gear.

Step 2: Locate the Oxygen Sensors

The upstream oxygen sensor is typically found in the exhaust manifold or the exhaust pipe leading away from the engine. The downstream sensor is positioned after the catalytic converter, along the exhaust pipe. Use the vehicle’s manual and proper tools to locate both sensors accurately.

Step 3: Disconnect the Battery

To prevent any electrical mishaps, disconnect the negative terminal of the vehicle’s battery.

Step 4: Remove the Old Sensors

Carefully loosen the sensor connections using the appropriate wrench or socket. Some sensors might be rusted or tightly fastened, so be patient while removing them.

Step 5: Install the New Sensors

Install the new 250-24105 upstream downstream oxygen sensors in their respective positions. Ensure they are tightened securely but avoid over-tightening.

Step 6: Reconnect the Battery

Once the new sensors are in place, reattach the negative terminal of the battery.

Step 7: Clear Error Codes (If Necessary)

In some cases, after replacing the oxygen sensors, you might need to clear error codes using an OBD-II scanner. This will reset the ECU and allow it to adapt to the new sensors.

Step 8: Test the New Sensors

Take your Honda CR-V LX for a test drive to ensure everything is functioning correctly. The ECU might take some time to adjust to the new sensors and optimize the air-fuel mixture.


You have successfully replaced the 250-24105 upstream downstream oxygen sensors in your 2001 Honda CR-V LX. By performing this crucial maintenance task, you have taken a significant step towards ensuring your vehicle’s engine operates at its best, delivering better performance and lower emissions.

Remember, regular maintenance and attention to detail are the cornerstones of keeping your 2001 Honda CR-V LX in top-notch condition. Stay tuned to my blog for more automotive tips, tricks, and DIY guides to enhance your driving experience and keep your car running smoothly. Safe driving!