The BMW 635CSi oxygen sensor is perhaps one of the most overlooked components on your vehicle. When there is a drop in your fuel mileage, you may blame it on clogged fuel injectors, a dirty air filter, a rough-running exhaust system—anything but your 635CSi oxygen sensor. However, if a tank of gas is not getting you as far as it used to, the problem can often be traced to your BMW 635CSi oxygen sensor.

Your 635CSi oxygen sensor is part of a network of sensors that monitors the oxygen-to-fuel ratio in your combustion chambers. Within this network, the BMW 635CSi oxygen sensor is the only one located near the exhaust manifold.

Of course, this means that your 635CSi oxygen sensor is able to take the most accurate measurements, as it can monitor the exhaust when it comes out of the combustion chambers. Your car's computer uses the information obtained from the BMW 635CSi oxygen sensor to determine the amount of fuel that should be injected into the combustion chambers. When your 635CSi oxygen sensor is not working, the computer must rely on the other sensors, which are not as accurate. Erring on the side of caution, your car will inject too much fuel rather than too little, as not enough fuel can cause serious damage to your engine. When you have a faulty BMW 635CSi oxygen sensor, your car is wasting gas. Furthermore, the excess fuel going through your exhaust system as a result of a bad 635CSi oxygen sensor can damage your catalytic converter, which is an even more expensive repair. If your fuel efficiency has recently dropped, don't overlook your BMW 635CSi oxygen sensor.Order a replacement from our convenient online catalogue.