You may already know that your car runs on a mixture of fuel and oxygen, but do you know how your car actually measures the amount of air that is in the mix? Your car's computer relies on information from your BMW 535i oxygen sensor to regulate the fuel-air mixture that powers your engine. The 535i oxygen sensor is located near your exhaust manifold. The function of your BMW 535i oxygen sensor is to measure the amount of oxygen in the exhaust leaving your cylinders, at a rate of hundreds of times per minute, and then send that data to your car's computer.

Of course, this means that your 535i oxygen sensor is responsible for a portion of your car's fuel economy. Since your car's computer uses the oxygen content of the exhaust to determine the amount of fuel that is injected into the cylinders, a faulty reading means wasted gas (your car will inject too much fuel rather than too little, as less than the required amount of gas will damage your engine).

When you have a faulty BMW 535i oxygen sensor, your fuel efficiency is not going to be as high as it should—and with today's high gas prices, that is bad news indeed. Other than a drop in fuel economy, signs of a bad 535i oxygen sensor include black exhaust smoke and a rotten egg smell from your exhaust. If your car fails an emissions test, a faulty BMW 535i oxygen sensor could be to blame.You can replace your bad 535i oxygen sensor with a high quality BMW 535i oxygen sensor from our extensive online catalogue at a discount price.