The BMW 325 oxygen sensor communicates with your car's computer to regulate the amount of fuel that is injected into your combustion chambers. The function of the 325 oxygen sensor is an important one. Your car relies on a measured mixture of oxygen and fuel to produce the power it needs to run the engine.

The BMW 325 oxygen sensor ensures that just the right amount of fuel is being used—no more, and no less. If you have a faulty 325 oxygen sensor, it is likely that your car is injecting too much fuel into your combustion chambers.

When the BMW 325 oxygen sensor is not working, the computer relies on other sensors to supply information about the oxygen level entering your engine. However, the 325 oxygen sensor is the only one located near the exhaust manifold, so it provides the only truly accurate measurements. Without a working BMW 325 oxygen sensor, your car will err on the side of caution and use too much fuel, because too much is better than too little. This means, quite simply, that a bad 325 oxygen sensor will lower your fuel economy, and you will burn through a tank of gas faster. With fuel prices as high as they are these days, it make sense to ensure you have a functioning BMW 325 oxygen sensor. A diagnostics test can sometimes detect a faulty 325 oxygen sensor, but this is not always accurate, as some BMW 325 oxygen sensors will work intermittently when they are beginning to fail. Another way to catch a bad 325 oxygen sensor is through an emissions test. If you are experiencing lowered fuel economy, pick up a replacement BMW 325 oxygen sensor from our extensive online catalogue.