Just got a 2.7 5 lug manual, and it has a p0125 code. I've never seen or heard of this before today, but from what little I could find, it has to do with the 02 sensors? The front o2 sensor appears to be newish. Also has a multiple cylinder misfire and cylinder 2 misfire, not sure if that would have anything to do with it? Just trying to figure out where to start.

 

https://www.yourmechanic.com/article/-p0125-obd-ii-trouble-code-insufficient-coolant-temperature-for-closed-loop-fuel-control-by-paul-lancette

^^good guidance there on what to check.

o2 sensor not really, but it can be affected by this malfunction

With your other post, you're on the right track, plugs and a thorough tuneup are the best places to start.

An old engine and a new buyer, basically start from scratch, unless you have dibs on PO details.

 

Well, I found a bad plug wire, and she just purs now. Had my obd2 reader hooked up, and the coolant temp was right, along with my gauge. If that matters. But I cleared all my codes and none have come back yet.