If it's as intuitive as the check engine lights we have today, it could mean anything from a slightly dirty plasma conduit to 'the warp core is mid-breach'.
You know, now that it's being discussed... with all the LCD screens in a modern car, it should show you the problem already instead of that bullshit light.
Just imagining Tom Paris rocking up, shoving Geordie out of the way, and starting a lecture on 20th century earth automobiles.
Geordi: It's nothing to worry about really, Data. If we were on the original NCC-1701, this would be a bigger deal, but on modern models like ours, we can probably safely ignore this for a while.
I think it means you need to reverse the polarity of something. Or do something with auxillary power.
The ship has been rearranged in design with both warp core engines aimed in two different angles for maximum efficiency.
If it's anything like my vehicle, they forgot to securely tighten the gas dilithium cap after refueling.
"... and for some reason the ODB 2 connector is under your console on the bridge, Data. You have to take the ashtray out to get to it." - Geordie, probably