After about 100,000 miles, your Honda Accord's oxygen sensor may fail and need replaced. The oxygen sensor regulates the oxygen levels in your fuel. This controls your gas mileage and also prevents harmful exhaust fumes from being created and expelled out of your exhaust pipes. Once the sensor fails, your Honda will run poorly and get low gas mileage. You can safely replace the oxygen sensor yourself with just a few tools.
Place your Accord in park and let it cool. This will allow the engine and exhaust to cool and preventing burns during the oxygen sensor replacement.
Open the driver's side door and pull the hood latch to pop your hood. Open the hood and locate the oxygen sensor on the passenger side on the exhaust manifold. The oxygen sensor looks like a round plug.
Spray some WD-40 around the edges of the oxygen sensor to loosen it for easy removal. Use the wrench to unscrew the sensor and remove it from it's port. Unplug the sensor's wires from the electrical harness.
Apply some of the anti-seize paste to the threads of the new oxygen sensor. This will make for easier removal for the next time. Be careful not to get any of the paste on the sensor itself or it could cause it to malfunction or fail prematurely.
Connect the wires of the sensor into the electrical wiring harness of the Accord. Screw the sensor in place securely with the wrench. The new sensor will be working right away. Close the car hood.
