Daily driving subjects cars to a lot of wear & tear. Your vehicle would need recommended tune up intervals to give optimal performance. Even a small malfunction can make a huge difference in safety and performance.
A typical tune up will involve checking all belts and hoses, flushing and filling vehicle fluids, checking the battery, adjusting or replacing spark plugs, checking fuel injectors and installing a new air filter. Emission tests are very important for every vehicle to pass the eligibility criteria.
There are some rules and regulations formulated by the states and countries which should be abided by all the automobile companies. Emission tests are done to check the percentage of emitted gases from a particular vehicle. There is a certain limit for this and vehicles should not pass that limit. Volkswagen economic lawsuit claim was the biggest tragedy that ever happened in the automobile market. This company cheated on emissions test by putting a defeat device in their cars which do not show the exact emission rate.
Experts use modern automobile diagnostics to reveal maintenance issues:
The "Service Engine" or "Check Engine" lights stay on after starting the vehicle.
The car stalls indicates electronic sensor issue or a spark plug. The engine runs unevenly during acceleration.
Dirty emissions system can also cause cars to sputter or stall. Sputtering while accelerating indicates that the car needs a tune up.