P0430: Catalyst System Efficiency Below Threshold (Bank 2)

Last Updated on May 3, 2020 by themechanic

The internal combustion process produces a lot of hazardous gases. If these gases were to get released into the atmosphere, it would have a negative impact on the environment and the air that we all breathe. That is why car manufacturers have placed a catalytic converter into the vehicle. The function of the catalytic converter is to reduce the number of hazardous pollutants in the gases. This ultimately reduces carbon emissions and helps keep everyone safe.

If there ever comes the point when the catalytic converter fails to do its job properly for whatever reason, then it’ll cause an increase in the number of dangerous pollutants that’ll get released by the vehicle. The symptoms of this problem include a rotten egg smell, poor fuel economy, weak engine power, and the Check Engine warning light turning on.

When you run a diagnostic check on the powertrain control module, and it shows trouble code P0430, then it means your catalytic converter is under its efficiency threshold in bank 2. In other words, it is unsuccessfully reducing the dangerous pollutants, which is detected by the powertrain control module. Whenever this problem is detected, the module will produce trouble code P0430 for the diagnostic scanner.

Your first instinct might be to think the catalytic converter itself is damaged or faulty. While this is this most common cause of trouble code P0430, there are some other possible causes too. There could be an exhaust system leak, bad air-to-fuel sensor, bad oxygen sensor, engine misfire, rich air-to-fuel ratio, lean air-to-fuel ratio, or lead in your gasoline. You’re probably not going to know which one is the problem unless you have a professional examine your car.

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Your driving will be impacted by this problem, so don’t let it go unfixed for too long. Poor acceleration could lead to an accident or cause other components in the vehicle to get damaged. Then you’ll be paying a lot more money in repair costs than necessary. The sooner you bring your vehicle to a mechanic and have the proper component fixed or replaced, the less expensive it will be for you.

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