These days it seems like everything is run by computers, and that includes your car. The Audi TT oxygen sensor works with your car's computer for an important purpose: to regulate the amount of oxygen that mixes with your fuel. Why is this important? The TT oxygen sensor strives for a 14.7:1 ratio of oxygen to fuel.

This ensures that your car uses neither too much nor too little fuel. Located near your exhaust manifold, the Audi TT oxygen sensor measures the oxygen levels present in the residue of your engine's combustion cycle.

The information your car's computer receives from the TT oxygen sensor dictates how much fuel is injected into your combustion chambers. When your Audi TT oxygen sensor is not functioning properly, the result can be either a "lean" fuel mixture (too much oxygen) or a "rich" fuel mixture (too much gasoline). Most often your car will use too much fuel when your TT oxygen sensor is faulty, because too little fuel can cause serious damage to your engine. With a bad Audi TT oxygen sensor, your fuel economy can drop considerably. Furthermore, the excess fuel your car uses when your TT oxygen sensor is not working will eventually damage your catalytic converter. A diagnostics test can sometimes detect a faulty Audi TT oxygen sensor, or you may discover your TT oxygen sensor is not working during an emissions test. Poor fuel efficiency or sluggish engine performance may also indicate a bad Audi TT oxygen sensor.With the high price of gasoline these days, it makes sense to install a new TT oxygen sensor to ensure you're getting the most mileage from every tank of fuel.