A Mercury Grand Marquis Catalytic Converter isn't "rocket science" - it's actually chemistry, but it's not all that complicated. The potentially deadly combination of carbon monoxide and nitrous oxide contains a molecule of carbon, a molecule of nitrogen, and two molecules of oxygen. If the oxygen molecule is taken away from the nitrous oxide and added to the carbon monoxide, the result is carbon dioxide and nitrogen.

Simple nitrogen is the most common gas in Earth's atmosphere, and we breathe it everyday, while carbon dioxide is relatively innocuous compared to carbon monoxide. By using a platinum catalyst, the Mercury Grand Marquis Catalytic Converter breaks the molecular bonds of toxic gases, while recombining them into less harmful compounds.

It's not a perfect solution, but is far better than the alternative. Today's catalytic converter is much different than those power-draining, pellet-filled converters of the 1970's. The modern Mercury Grand Marquis Catalytic Converter uses a piece of ceramic coated with a compound made of platinum and palladium as a catalyst. Because of this, a new catalytic converter can be an expensive proposition. When your own catalytic converter is damaged, however, you can count on us to have a quality replacement on hand at the absolute lowest price anywhere. There is a relatively simple test you can perform if you suspect that your catalytic converter is damaged or defective: remove the oxygen sensor, then start the engine and rev it to about 4,000 RPMs. A whistling sound will tell you that your catalytic converter is clogged. If you can find a catalytic converter for your Mercury Grand Marquis for less, email us that URL.We will meet or beat any competitor’s price!