Your BMW 735i oxygen sensor is one of the hardest working and most often overlooked components of your car. The 735i oxygen sensor is located near your exhaust manifold. When your combustion chambers release red-hot exhaust gases, your BMW 735i oxygen sensor measures the oxygen content of that exhaust hundreds of times each minute and sends the data it gathers to your car's computer.

The computer then uses the information from the 735i oxygen sensor to determine how much fuel should be injected into the combustion chambers. There are other sensors in your car that assist in measuring oxygen content, but the BMW 735i oxygen sensor is the only one situated in the direct path of your exhaust.

This means that when your 735i oxygen sensor is faulty, your computer is not receiving an accurate oxygen content reading. Your car strives for an optimal oxygen to fuel ratio of 14.7 to 1. When it cannot get the right data from the BMW 735i oxygen sensor, it has to guess, and it will not reach that optimal mix. Typically, the results of a faulty 735i oxygen sensor is a "rich" fuel mixture—your car uses too much fuel in an effort to avoid the damage that results from too little fuel in the combustion chambers. One of the obvious results of a bad BMW 735i oxygen sensor, therefore, is wasted gas. A faulty 735i oxygen sensor can also cause your engine to run hot or perform poorly. Over time, the extra fuel running through your exhaust system will damage your catalytic converter as well. If you have a faulty BMW 735i oxygen sensor, you should replace it right away to restore your fuel efficiency and protect your expensive catalytic converter.Order your new 735i oxygen sensor from us and save money in more ways than one.