Beneath your car in an enlarged section of your exhaust pipe resides your BMW 540i catalytic converter. The 540i catalytic converter is an essential part of your car's exhaust system. Without it, your car would constantly spew toxic exhaust gases into the environment, harming the atmosphere as well as making you sick if the exhaust entered your cabin.

Your BMW 540i catalytic converter is a honeycomb filter that contains small amounts of platinum, palladium and rhodium. The precious metals found in your 540i catalytic converter make it a relatively expensive part, but they also serve an important purpose.

When exhaust gas from your engine passes through your BMW 540i catalytic converter, the toxic molecules of carbon monoxide, hydrocarbon, and nitrous oxide undergo a chemical reaction as a result of the metals embedded in the filter. The 540i catalytic converter then re-forms the smashed molecules and creates harmless nitrogen, water vapor, and carbon dioxide, which are then released through your tailpipe. It can be difficult to determine when there is a problem with your BMW 540i catalytic converter. Most often, a faulty 540i catalytic converter is detected during other exhaust work. A damaged muffler may result in damage to your BMW 540i catalytic converter as well. Also, if your oxygen sensor is not working, the excess fuel in your exhaust can damage the 540i catalytic converter. If you need a new BMW 540i catalytic converter, but you don't want to spend a fortune having a mechanic replace the part, feel free to browse our extensive and easy-to-search online catalogue. You will find a high quality replacement 540i catalytic converter at a great discount price, and you will save even more by installing it yourself.