The radio doesn't sound like it's supposed to. It doesn't matter what settings you use or how much you try to tune it in the sound always has noisy interference and makes it difficult to hear radio programs and music.
The level of hydrocarbons coming out of the exhaust is above the legal limit. Exhaust hydrocarbon content is generally unburnt fuel and is a sign of poor combustion in the engine.
The dashboard warning light showing on this page (or one very similar, sometimes a slightly different shape or colour) has appeared on the dashboard and doesn't go off when the car is running.
At idle speed the engine sounds like it's about to stall, it improves when the accelerator is pressed down but when idling in traffic it sounds like it's struggling to run properly.
The fuel gauge seems to be going down quicker than usual, the car is using more fuel when driving in the same way as before.
The engine sounds like it's not running correctly, the engine sounds rough as if it's not running in time.