The gasoline engine of your BMW M3 runs perfectly when the mixture of air and fuel is balanced. The air-fuel mixture has to be controlled so as to discourage the emission of exhaust pollutants. The lowest emission that can ever be achieved is with a slightly lean mixture of the elements. The catalytic converter of your BMW M3 plays a vital role in the emission control system of your auto to ensure a lean air-fuel mixture. Along with the catalytic converter is the BMW M3 Oxygen Sensor. BMW Oxygen Sensor detects the mixture by measuring the volume or amount of oxygen present in the vehicle’s exhaust gas. The engine’s fuel-injection system will then trim the air-fuel mixture if it exceeds the required amount. It will be made richer depending on the signal shown by the oxygen sensor. As you can see, the oxygen sensor performs a vital role in the system that when omitted, it will subject the vehicle into performance depreciation and poor processing. Choosing the right type of oxygen sensor is the best way to avoid this kind of situation from happening. And if it is for your high performance car, nothing beat pairing it with the same high performance oxygen sensor to match it-- Replacement Oxygen Sensor. Replacement Oxygen Sensor is manufactured and designed to best fit your BMW particularly the 1996-1999 BMW M3. It is made entirely of high level materials to grant it a longer and stronger job capability. If its oxygen sensor you want, it’s Replacement you should get!