A lot of things...specifically that something is wrong..take it into autozone and they'll plug into it and see what the trouble code is and tell you what's wrong.
The best way to reset the engine warning light on a Nissan Primera p12 would be to take it to a mechanic. It is best to have a mechanic check it out to make sure nothing is wrong that could malfunction and put someone in danger. The mechanic will be able to reset the engine warning light.
if you are talking about the orange light that looks like (sorta) a house, it would be a low coolant warning light. apparently, that is supposed to be a radiator.
Depending on the year of the truck, some of the new models the engine light will turn on if you did not close your gaz tank cap tight( three clicks)... Either way engine light will not turn off until you "reset" the warning lights usually with a computer from your garage or dealer. They will be able to read the warning code and tell you exactly what went wrong. if that doesn't work another thing that would defiantly be worth checking into would be your catalytic converter could be partially plugged
Yes.
A flashing check engine light is an indication of a misfire. See related questions
NO. That means the engine is running too hot. Check cooling system.
YES
depends on what the light is for? engine light? amber means its not serious but i would get it seen to straight away. the stop light means its serious
this is for safety so engine does not get ruined,check oil level!!
If it is easy, your gas cap is not on correctly.
The check engine light would come on.
The engine coolant temp sensor can do that. If you have a check engine light on, have the codes read.