Your Audi A4 fuel injectors are part of your engine's combustion system. A4 fuel injectors are precision instruments designed to inject just the right amount of fuel into your combustion chambers, where the spark from the spark plugs allows it to burn quickly and create the power your car uses to run. Your Audi A4 fuel injectors are constructed with a number of tiny parts such as seals and o-rings that allow for controlled and measured fuel spray.

The timing of the spray from your A4 fuel injectors is just as important as your engine's firing sequence timing. Generally, Audi A4 fuel injectors will keep running well for about 40,000 miles.

There are two common problems that occur with A4 fuel injectors. The first is when the sediment or old fluids in your engine clogs the spray ports of the Audi A4 fuel injectors. Clogged ports do not spray fuel in a straight stream as they are supposed to; rather, the fuel spray is diverted in several directions. Clogged A4 fuel injectors reduce fuel economy and engine performance. The second common problem with Audi A4 fuel injectors happens when all those tiny parts become worn due to normal wear and tear. When the seals and o-rings of your A4 fuel injectors are no longer intact, the result is fuel leakage that not only wastes gas, but has the potential to start an engine fire. If you notice a reduction in fuel efficiency, or your car seems sluggish when you drive, checking your Audi A4 fuel injectors is a good place to start. You may be able to unplug clogged injectors with a fuel injector cleaner that is added to your gas tank. However, if your A4 fuel injectors are leaking, there is nothing to be done but replace them.