You may be driving along thinking that everything is fine, when you try to accelerate and notice that your car simply will not pick up speed and limps along at 20-30 mph. This can not only be annoying but dangerous if you are on a motorway for example. Often when this happens it is because your car has gone in to limp mode. Limp mode is a function that temporarily slows the car right down to prevent further damage to the engine. It can come on for a number of reasons such as a faulty sensor or damaged to an air pipe.
If you find that limp mode comes on then you need to take the car to a garage as soon as possible. Try and get it recovered if possibly or if the garage is some distance away from your home. Most garages will usually start by putting it on a diagnostic machine to see if it brings up any error codes. From this they can usually work through the codes (if there are any) to find out what is causing the issue. If they cannot find an issue they may reset the diagnostic on the car and send you on your way. Often if this happens, the error will occur again at a later date.