[LPete]

I’d believe that if it drove itself lean and then the extra fuel stopped (maybe it stopped purging or the canister cleaned out). I don’t think it drove the mixture lean and then set a lean code just because it leaned itself out. That’s not how any feedback system works. I’ve worked on this stuff for a long time and never seen that (or a vacuum leak causing a rich code). I will say, nothing is impossible, but if things act weird there’s always a reason.

 

[Jeepman]

Chrysler Town and Country P0175: Causes, Diagnosis, How to Fix | Drivetrain Resource

P0175 is a common trouble code that can appear in the Chrysler Town and Country. It's generic, so it has the same meaning for your van as it would any other automobile. There are MANY issues that can cause P0175 in the Town and Country. If there are other codes present, use them to eliminate

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[gravitylover]

I’d believe that if it drove itself lean and then the extra fuel stopped (maybe it stopped purging or the canister cleaned out). I don’t think it drove the mixture lean and then set a lean code just because it leaned itself out. That’s not how any feedback system works. I’ve worked on this stuff for a long time and never seen that (or a vacuum leak causing a rich code). I will say, nothing is impossible, but if things act weird there’s always a reason.

I had a pinhole leak in a vacuum hose cause various rich codes in my old hoopty supercharged Range Rover. I couldn't quite reach both ends easily to replace it but I was able to squeeze a dollop of silicone over the hole and that solved the problem.

 

[Long_Voyager94]

In theory, sure. Reality however is mopar ecms rarely do what “makes sense”