80,000 miles - Automatic Warning Light?

The E series does not have any automatic reminders. As mentioned there are places to check the code for free. But sometimes be fault will go away on its own and not come back.

Gretings,

Step One:
Disconnect your battery and then reconnect it.
This will reset the Check Engine light.

Step Two:
If the light comes on again, ask whoever you pick to service your rv to do a Pressure Check on the GAS CAP! That's the cheapest diagnostic test to do. You'd be surprised as to how many worn gas caps cause these problems as the seal is worn down and the pressure valve does not function properly. This leads to several EVAP, etc. error indicators from the on-board rv engine computer.

Step Three:
ALWAYS screw on your gas cap fairly tightly after every fillup!

Believe me...been there ... done that!

If Check Engine light continues, go for full-blown diagnostics as it may be a valid engine problem.

Regards,
Ray

There many Auto Zones and O'reillys depending on your route.
Bellingham several couple on SR 539 just north of Bellingham.
Just off I-5 in Burlington, Mt. Vernon Marysville and Everett.

JUST crossed into Suma, WA today. First stop in US since we left home. (Alaska)

Go by an O'Reillys or Auto Zone and have the code read. They can shut it off it is just a mileage reminder.
What is your location?