Long time no speak gentlemen. On our 2001 XLS we got some error codes during a recent road trip. Fuel trim for bank 1 and 2, codes P0170 and P0173. On top of those we got code P0125 for insufficient coolant temp. They came up while pulling a pass and she runs as awesome as ever, never a hint of a problem. Coolant levels are good but it has been a while since a full tune. She just turned over 215k miles and I'm hoping this isn't the beginning of the end because she's been such a great car. Any thoughts on what the cause could be from the gurus?
PS hi Ray long time no visit!

Hows the heat gauge? Lower than normal? If engine heat OK then you should check the ECT sensor for proper operation. You can OHM it when engine cold and when engine hot then check resistance against spec. If it is telling computer engine is cold then you'll get rich run when hot. The fuel trims will attempt to compensate but the codes mean they're at the max.

"Insufficient cooling temp"...

As in engine is running lower temp than required for proper operation of a fuel injected system?

Might want to check your thermostats for proper operation. Coolant in a constant recycle will not come up to full temp, generall 190-200 degrees.