P0138 *and* P0442 at same time

[Reprise]

Had my SES light come on right after filling up the tank today.

Got home and scanned;
P0138 is O2 high voltage on bank 1, sensor 2 (so, a downstream one, and shouldn't be 'urgent') No change in drivability detected.
P0442 is evap system 'small' leak

Individually, I wouldn't be worried about either of these very much at all, but... Any correlation to the two showing up together?
Didn't see much here on P0138, and not much elsewhere on the two showing up together.

Funny thing - I was driving the Voy to pick up my trailer, thinking how well it was running and how the ride wasn't nearly as punishing as the Sierra HD.
Then I filled up the tank, and got the SES light. Cruel irony...LOL

 

[Mooseman]

Probably just the O2 sensor died. Should be an easy fix. And yeah, no urgency.

For the evap lleak, could be the seal on the cap starting to leak. Again, I would just replace it and hope that`s it.

Probably just a coincidence. Absolutely not related to each other.

 

[Reprise]

Thanks - I didn't think so, but figured I'd check. I hooked up the Tech2 and didn't see anything amiss (besides the codes), so I cleared them, as the SES makes one think something needs attn ASAP. We'll see if they come back. Right now, I want to focus on the Sierra's needs...lol.