Amber: get it checked soon
Engine warning light
The engine's computer has logged a fault. The car may drive normally, but get it looked at soon. If the light flashes, ease off and get it checked straight away.
Red: stop when it's safe
Oil pressure
Pull over when it's safe and switch the engine off. Once it's cooled, check the oil level. If the light stays on with the oil topped up, don't drive it.
Red: stop when it's safe
Engine temperature
The engine is running too hot. Pull over when it's safe and switch off. Never open the coolant cap while the engine is hot.
Red: get it seen today
Battery charging
The battery isn't being charged, often the alternator or its drive belt. The car will keep going until the battery runs flat, so head straight home and switch off what you can, like the heater fan and heated screen.
Red: stop when it's safe
Brake warning
Check the handbrake is fully off. If the light stays on, the brake fluid could be low or there's a fault with the brakes. Don't drive it until it's been checked.
Amber: get it checked soon
ABS
The anti-lock system has a fault. Your normal brakes still work, but the wheels can lock under hard braking. Drive gently and get it checked.
Amber: get it checked soon
Tyre pressure
One or more tyres is low. Check the pressures at the next forecourt and look for a puncture. Some cars need the warning resetting afterwards.
Amber: deal with it soon
AdBlue
Diesels only. Either the AdBlue tank is low - top it up at a forecourt, never into the fuel tank - or the system has a fault. Many cars count down to a point where the engine won't restart, so don't ignore it.
Lights vary from car to car - your handbook has the exact meaning for yours.