Mercedes Benz Oxygen Sensor

The engine of your Mercedes Benz needs two things in order for it to produce mechanical power: air and fuel. Air is delivered to the engine by the air intake system while fuel is delivered by the fuel delivery system, with the two mixing up in the intake manifold. Simply injecting air and fuel into the vehicle’s engine, however, is not enough to maximize the capability of the engine. For maximum output to be achieved, the engine must receive just the right mixture of air and fuel. Among those parts that help to achieve this proper mixture is the Mercedes Benz oxygen sensor. 

An oxygen sensor is a small electronic device inserted into the exhaust system of gasoline-powered vehicles, especially on those vehicles produced after 1980. The main function of the O2 sensor is to measure the amount of air remaining in the exhaust gases. The data obtained by the oxygen sensor would then be delivered to the engine management ECU computer. Based on this data, the ECU computer determines whether the mixture of fuel and air fed into the engine is rich (too much fuel) or lean (too little fuel) and adjusts the amount of fuel being injected to the engine accordingly.

For gasoline to burn efficiently, an air to fuel mixture with a ratio of 14.7:1 must be achieved, although this ratio may differ for different fuel grades. If the oxygen sensor is malfunctioning or is already damaged, there will be no way for the ECU computer to determine whether the fuel to air mixture is well within this ratio. With the computer left guessing, it may deliver more fuel to the engine than what is actually needed. This would further lead to inefficient fuel combustion resulting to increased exhaust emissions. Oxygen sensor malfunction or deterioration may also lead to more damages on various other parts of the vehicle, including the engine and the catalytic converter.

So if your Mercedes Benz oxygen sensor is already damaged or malfunctioning, better replace it at once with a new unit. Sadly, there is no easy way to determine whether the oxygen sensor is still functioning well or not. For this reason, many automotive experts would recommend replacing the oxygen sensor(s) in regular intervals. For your Mercedes Benz, better check your vehicle repair manual or contact your dealer for the details of this interval.