What does the wrench light mean on a 2008 Lincoln MKX?

On the 2008 Lincoln MKX or MKZ, the wrench light mean a number of different things. It's a general trouble indicator for many of the same things that a check engine light would indicate -- but with a few more thrown into the fray. Without an OBD-II scan tool, diagnostics will be difficult, if not impossible. The wrench light is accompanied by one or more fault codes. If You read these codes, You'll have the ability to narrow down Your diagnostics significantly. Even if You're not able to find the specific cause from the first trouble code, You'll at least have an idea of which system component to begin with; this can be tremendously helpful when beginning Your diagnosis or repair.