So doing some searching, I have found that everybody refers to P0545 being one of two things.
Exhaust Gas Temperature Sensor Circuit Low
A/C Clutch Relay Circuit Problem
Which is it?
A/C is working fine. Idle has always been a little rough since I got it, but code is new. Was told it smells like its running rich when driving, but at idle is smells fine. When I clear the code, it comes right back as soon as I turn on the ignition. Ideas? Maybe O2 sensor time? I'll bet they're originals with 200k on them.