Your Mercedes sedan is a finely crafted machine. By keeping your Mercedes E420 oxygen sensor in optimal condition, you can help your vehicle stay that way. A poor sensor can cause surging or hesitating because there is nothing that regulates the amount of oxygen that is in the fuel system.

Too rich of a fuel causes problems, but too poor of a fuel is equally bad for your engine. Unstable fuel can not only cause fuel economy problems, but also can damage the catalytic converter.

When the Mercedes E420 oxygen takes a reading it sends it to the Electronic Control Unit (ECU) which in turn adjusts oxygen levels to control the efficiency of the combustion engine. Depending on the year that your particular automobile was made determines how frequently the oxygen sensor should be replaced. For those that have an unheated sensor in a vehicle made between 1976 and the early 1990s, it should be replaced every 30,000 to 50,000 miles. For vehicles with a heated sensor made between the mid 1980s and the mid 1990s, change it every 60,000 miles. For heated sensor vehicles made after the mid 1990s, replace it every 100,000 miles. It is entirely possible to increase your fuel economy by 10 to 15 percent. When you keep your Mercedes E420 oxygen sensor in fabulous condition, you are taking the necessary measures to take care of your sleek and stylish machine. Both your engine’s power and your fuel economy will benefit. Don’t forge that we offer free shipping for any order that equals over $50.We also offer a quality guarantee on all our parts.