The O2 sensor measures the content of the exhaust coming out of your Accord’s tailpipe and adjusts the air to fuel ratio accordingly based on the information it receives. Over time, the O2 sensor will fail. This might happen at 100,000 miles, or sooner. When it does happen, you will notice a dramatic decrease in performance. You may not be able to start your Accord, or your Accord’s idle may be really rough. At this point, you need to replace the O2 sensor.
Raise the Accord onto jack stands. Lift up the front of the accord with a floor jack using the front jack point. Slide the jack stands under the front pinch welds and lower the Accord onto the stands.