Replacing Air-Fuel Ratio Sensor: Honda Crv Guide

If you're looking to change the air-fuel ratio sensor in your Honda CR-V, you've come to the right place. This is a common issue for owners of 2007-2009 Honda CR-V models, as a melting grease issue can cause the Check Engine light to come on. Luckily, the fix is relatively straightforward. You'll need to replace the sensor and install a new subharness kit, which you can purchase with part number 06322-SWA-305, H/C 9050097.

First, locate the right branch of the engine harness, which is attached to the right-side frame rail near the power-steering hose. Cut the harness' clip to free it from the rail. Next, put the SUV on a lift to access the air/fuel ratio sensor. Disconnect the sensor's connector, remove the sensor, and install the replacement. Then, disconnect the engine harness' 4-pin connector from its retaining clip and connect it to the taped portion of the subharness. Attach the subharness to the frame rail and connect the new sensor's connector to the other end of the subharness. Finally, insert the subharness' retaining clip into the hole in the frame rail and secure the two harnesses together with the provided wire tie. This will create a loop that helps keep grease out of the replacement sensor's connector.

When purchasing a replacement sensor, it's recommended to buy either an OEM sensor or one from Denso, as other brands may not be compatible with your vehicle. You can find compatible Denso sensors on Amazon, eBay, and Advance Auto Parts, with prices starting at $63.65.

Disconnect the sensor's connector, remove the sensor, and install a replacement

Disconnecting the sensor's connector, removing the sensor, and installing a replacement is a straightforward process for the Honda CR-V. Here is a detailed guide:

Step 1: Disconnect the Sensor's Connector

Start by locating the engine harness attached to the right side frame rail, near the power-steering hose. Cut the harness' clip to free it from the rail. This will allow you to access the sensor's connector. Once you have located the sensor, disconnect its connector by gently pulling it away from the sensor.

Step 2: Remove the Sensor

After disconnecting the sensor's connector, you can now remove the sensor itself. The sensor is usually located near the engine or the exhaust manifold. It is typically secured in place with a threaded connection or a retaining clip. You may need to use a wrench or a screwdriver to loosen or remove the sensor. Be careful not to drop any debris into the engine or exhaust.

Step 3: Install the Replacement Sensor

Before installing the replacement sensor, it is recommended to apply anti-seize compound to the sensor's threads. This will help prevent the sensor from seizing up in the future. You can now install the replacement sensor by threading it into the same location as the old sensor. Make sure the sensor is securely tightened in place.

Step 4: Reconnect the Sensor's Connector

Once the replacement sensor is in place, reconnect the sensor's connector. Ensure that the connection is secure and that the connector is properly seated.

Step 5: Test the Sensor

After installing the replacement sensor, start the engine and allow it to reach operating temperature. Check for any error codes or warning lights on the dashboard. Take the vehicle for a test drive to ensure that the sensor is functioning properly.

It is important to note that you may need to reset the vehicle's computer or clear any error codes after installing the new sensor. This can be done using a diagnostic scanner or by disconnecting the battery for a few minutes.

Additionally, always refer to the vehicle's repair manual or seek assistance from a qualified mechanic if you are unsure about any steps or procedures.

Ensure the replacement sensor is the correct part

When replacing the air-fuel ratio sensor in your Honda CR-V, it is crucial to ensure that you have purchased the correct replacement part. This is important because installing the wrong sensor can lead to poor engine performance, reduced fuel efficiency, and even damage to other components. Here are some tips to help you ensure that you have the correct replacement sensor:

• Check the Part Number: Different sensors may look similar, but they can have different part numbers. Always verify that the part number of the replacement sensor matches the original sensor or the recommended part number for your specific Honda CR-V model and year. You can refer to your vehicle's owner's manual or consult a trusted mechanic or dealership to identify the correct part number.
• Consider the Brand: It is recommended to choose a replacement sensor from a reputable brand known for its quality and compatibility with Honda vehicles. Some popular brands for Honda CR-V sensors include DENSO and NTK. Using a trusted brand can improve the likelihood of getting a reliable and compatible sensor.
• Vehicle Compatibility: When purchasing a replacement sensor, ensure it is specifically designed for your Honda CR-V's make, model, and year. Different vehicles may have different sensor requirements, and using an incompatible sensor can lead to poor performance or damage.
• Sensor Type: There are two types of sensors: OEM (original equipment manufacturer) and aftermarket. OEM sensors are produced by the vehicle's original manufacturer and are designed to match the original specifications. Aftermarket sensors are produced by third-party manufacturers and may offer more affordable alternatives. Consider your budget and preferences when choosing between OEM and aftermarket sensors.
• Sensor Specifications: Pay attention to the specifications of the replacement sensor, such as the number of wires, length, and heating capabilities. These specifications should match your vehicle's requirements. For example, the DENSO Upstream Air Fuel Ratio Sensor compatible with the 2005-2006 Honda CR-V 2.4L L4 has dimensions of 5.75 x 2.19 x 1.88 inches and is an upstream sensor.
• Reviews and Recommendations: Before purchasing a replacement sensor, consider reading reviews from other Honda CR-V owners who have used the same product. Online forums, such as the CR-V Owners Club, can provide insights and feedback on specific sensors. Additionally, seek recommendations from trusted mechanics or automotive experts to ensure you select a reliable and compatible sensor.

By following these guidelines and cross-referencing multiple sources of information, you can increase the likelihood of obtaining the correct replacement air-fuel ratio sensor for your Honda CR-V. Remember that using the correct sensor is essential for optimal vehicle performance and fuel efficiency.

Cut the harness' clip to free it from the rail

To cut the harness clip to free it from the rail, you will need to identify the type of clip you are working with. There are several types of cable clips, each with a unique method of installation and removal.

The most common type of cable clip is the nail cable clip. As the name suggests, this type of clip is secured to a surface using a nail. To free the harness from the rail, you will need to carefully remove the nail using an appropriate tool such as a hammer and nail remover. Once the nail is removed, you can then lift the clip away from the rail.

Another type of cable clip is the screw-in cable clip. This clip is secured to a surface using a screw. To remove this type of clip, you will need a screwdriver. Simply unscrew the clip from the surface and lift it away from the rail.

If you are working with a self-adhesive cable clip, the removal process will be slightly different. These clips are attached to a surface using an adhesive strip, rather than nails or screws. To remove the clip, carefully pry or peel it away from the surface. You may need to use a tool such as a flathead screwdriver or putty knife to help lift the clip from the surface.

Once you have identified the type of clip and removed any nails, screws, or adhesive, you can then cut the harness clip to free it from the rail. Be sure to use appropriate safety gear, such as gloves and eye protection, when performing this task.

Disconnect the engine harness' 4-pin connector from its retaining clip

Disconnecting the engine harness 4-pin connector from its retaining clip is a crucial step in replacing the air-fuel ratio sensor in a Honda CR-V. This process can help resolve issues with the check engine light illuminating and trouble codes being stored in the PCM memory. Here's a detailed guide on how to perform this task:

• Locate the Engine Harness: Start by locating the right branch of the engine harness. It is usually attached to the right-side frame rail, near the power-steering hose.
• Free the Harness: Once you've located the engine harness, cut the harness' clip to free it from the rail. This will allow you to access and manipulate the harness more easily.
• Access the Air/Fuel Ratio Sensor: Put the SUV on a lift to gain better access to the air/fuel ratio sensor. This will provide you with the necessary space and visibility to work on the sensor.
• Disconnect the Sensor Connector: Before disconnecting the engine harness, you will need to disconnect the sensor's connector. This will ensure that you can safely work on the harness without causing any damage to the sensor.
• Perform the Connector Swap: With the sensor disconnected, you can now focus on the engine harness 4-pin connector. Disconnect it from its retaining clip. Refer to the illustration provided in the repair manual or a trusted online source to ensure you are working on the correct connector.
• Connect the Subharness: At this point, you should have the engine harness 4-pin connector disconnected from its retaining clip. Now, refer to the provided illustration or diagram to connect the engine harness connector to the taped portion of the subharness. This subharness is part of the recommended fix to prevent grease contamination in the replacement sensor's connector.
• Secure the Subharness: After connecting the engine harness connector to the subharness, attach the subharness to the frame rail. Ensure that it is securely fastened and won't interfere with any other components.
• Connect the New Sensor: With the subharness in place, connect the new air/fuel ratio sensor's connector to the other end of the subharness. This will integrate the new sensor into the vehicle's systems.
• Secure the Subharness Retaining Clip: To complete the installation, insert the subharness' retaining clip into the hole in the frame rail. This will ensure that the subharness is securely mounted and won't come loose during vehicle operation.
• Secure the Harnesses: Finally, use the wire tie included in the kit to secure the two harnesses together, forming a loop. This loop serves as a grease barrier, preventing grease from entering the replacement sensor's connector and causing contamination.

By carefully following these steps, you can successfully disconnect the engine harness 4-pin connector from its retaining clip and install a new air/fuel ratio sensor in your Honda CR-V.

Connect the engine-harness connector to the taped portion of the subharness

To connect the engine-harness connector to the taped portion of the subharness, follow these steps:

• Open the hood and locate the right branch of the engine harness, which is attached to the right-side frame rail. It should be near the power steering feed hose.
• Detach the engine harness from the frame rail by cutting through the harness body clip. Discard the clip.
• Raise the vehicle using a lift.
• Remove the old air/fuel ratio sensor. Disconnect the sensor with an O2 sensor wrench. Discard the old sensor.
• Install a new air/fuel ratio sensor and torque it to 33 lb-ft (33 Nm).
• Do not connect the new sensor's 4P connector yet.
• Disconnect the engine harness 4P connector from its clip.
• Connect the engine harness 4P connector to the new subharness 4P connector. This is the connector that is taped to the subharness.
• Attach the new subharness to the body rail with its body clip.
• Connect the new air/fuel ratio sensor's 4P connector to the connector on the end of the new subharness. Attach this connector to the harness clip.
• Use a wire tie to secure the new subharness to the engine harness. The loop in the subharness will prevent grease from entering the air/fuel ratio sensor connector.

Frequently asked questions