If you don’t need all of the space that the sedan model offers, there is a Coupe alternative, offering a sportier style and sleeker silhouette with only two doors. If the voltage of the downstream O2 sensor is constantly jumping between 0.1V and 0.9V, the catalyst is worn and the catalytic converter needs to be replaced. Honda Accord Delivers Comfort and Luxury in a Sedan The Accord is one of the most popular models in the Honda garage, having been initially launched onto the market in 1976. The downstream O2 sensor produces a relatively steady voltage reading of approximately 0.45V if the catalytic converter is functioning properly. With the Honda running and at normal operating temperature, use the digital multimeter to check the voltage reading of the downstream O2 sensor.If any leaks are found, repair the leak, clear the code, and complete several drive cycles to verify that was the fix.

Pay close attention to the exhaust manifold, gaskets, and exhaust pipes pre-catalytic converter. Examine the exhaust system for damage and leaks.If other codes are present, they must be addressed first.

Scan your Honda to verify P0420 is the only code present.

Honda P0420 Diagnosis Tools Needed to Diagnose: If any other codes are present, they should be addressed first. Honda Code P0420 Common Diagnosis Mistakesĭo not overlook other codes that are paired along with P0420. It is recommended that you address P0420 as soon as possible to keep the cost of the repair to a minimum. While P0420 does not pose a danger to the driver and may not produce any symptoms with issues related to drivability, it can cause severe damage to other components of your Honda if not addressed in a timely manner.

Worn and internally failing catalytic converter.

Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by your Honda. The function of the catalytic converter is to break down harmful pollutants that are created by your Honda during the combustion cycle and convert them into harmless gases. Catalyst system efficiency below threshold (Bank 1).

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