If error P0430 triggered your check engine light, then there is probably something wrong with your vehicle’s catalytic converter. Error code P0430 means catalyst system efficiency below threshold (bank 2). In other words, your vehicle’s catalytic converter is not effectively acting to convert raw exhaust into treated exhaust the way it is supposed to. Without this component functioning properly, your vehicle will be creating much more air pollution than it is supposed to. Meaning you’ll fail any emissions test until you take care of it. You also may experience diminished fuel economy, reduced power, a bad smell emanating from your tailpipe, and more.
Find Out Exactly Where the Problem Lies
Check Your Fuel System
The problem may not necessarily be with your catalytic converter. It could also be caused by a problem with the fuel system or faulty oxygen sensors. If your fuel-air mixture is too rich, you will produce thicker exhaust as a result of burning too much fuel. Likewise, if your oxygen sensors aren’t functioning properly, you could be getting an imbalanced mixture. Check to make sure all of the components of your fuel system are working properly including your fuel pump and fuel pump regulator. Check your oxygen sensors by attaching a voltmeter and making sure the indictor responds accordingly when you pull the throttle. You can also replace your sparks plugs, fuel filter, and air filter and see if that solves the problem.
Try Using a Catalytic Converter Cleaner
Error code P0430 is similar to error code P0420 in that it deals with the catalytic converter and the exhaust system. It could be that your catalytic converter is clogged up with gunk from years of heavy or even moderate use. The cheapest and easiest way to take care of this is by using a specially formulated catalytic converter cleaner. All you have to do is pour the entire bottle into your gas tank and drive it as normal. After the tank is empty and you begin driving it on a fresh tank of just gasoline, you may notice some improvements in the way it runs. After driving it for a dozen or so miles, you can have your emissions checked. If this method doesn’t do the trick, you may have to replace the part completely.
Last Resort: Replacing Your Catalytic Converter
Changing your catalytic converter yourself is not an easy job if you have a relatively old car. Dealing with deteriorating gaskets and crud covered nuts and bolts isn’t exactly a walk in the park, but it may save you a lot of cash. You can also attempt to clean your catalytic converter by hand and then put it back on and try it. Either way, the sooner you get the problem fixed, the better.