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Catalytic Converters for Subaru Impreza

The fitment for catalytic converters on the Subura Impreza are typically for a direct replacement or to enhance performance. A four-cylinder automobile may come equipped with one or two of these, and a six or eight-cylinder automobile may be equipped with up to four. The quality of the part is critical for performance and reliability.

What brands offer catalytic converters for the Subaru Impreza?

Some of the brands offering catalytic converters for the Subaru include AP Exhaust, Bosal, Davico, DEC, and Eastern Catalytic. Eastern Manufacturing, Magnaflow, and Walker also offer converters for this Subaru vehicle. These brands offer this converter for other models as well, like the Outback.

What is a catalytic converter?

These parts of the car are designed to convert hazardous exhaust gases from the engine into emissions that are less harmful as they exit the exhaust system. These parts look similar to a muffler and are typically constructed with a steel housing encasing a honeycomb made of ceramic that contains rhodium, palladium, and platinum.

How does a catalytic converter work?

The sections inside the honeycomb contain elements that trigger different chemical reactions as the temperature exceeds 400 degrees Fahrenheit. Hazardous compounds produced by the engine like NOx, HC, and CO are converted into less harmful emissions, like N, H20, and CO2, as they leave the car's exhaust.

The first section within the ceramic core is known as the reduction bed. This section contains rhodium and is designed to reduce harmful NOx gases down to harmless oxygen and nitrogen emissions. The next section, the oxygen storage bed, is coated in cerium and designed to maintain the proper levels of oxygen inside the vehicle's exhaust system. This is accomplished by utilizing the oxygen stored from the reduction bed.

The final section, the oxidizing bed, is coated with the palladium and platinum. This section adds the oxygen to the CO gases produced by the vehicle's engine. This section also uses elements of oxygen to burn off any HC remaining before exiting the car's tailpipe.

How do you know when your Subaru needs a replacement?

Vehicles are typically equipped with multiple sensor and monitor systems that help alert drivers when the converter needs to be replaced. The O2 sensor is located downstream to help compare the levels of oxygen before and after gases pass through the converter.

There are a number of telltale signs that could be an indication that the converter is failing or needs to be replaced. The quality of fuel efficiency could drop suddenly. Acceleration may begin to lag or respond poorly when stepping on the gas pedal. Your Subaru Impreza may fail to start up altogether if these components fail to work correctly.

In addition, the Subaru may also have trouble passing emissions tests if these components begin to fail or malfunction. If the check engine light comes on, it could also be an indication that the part needs to be replaced.