Coburg heading north, then back to Coburg, Oregon

We drove our coach 113 miles, about two hours of driving, from Cummins Coach Care in Coburg, Oregon towards our our home base, but turned around in Salem when the Check Engine and MIL lights came back on with the same error code. Here’s a map showing our route, heading north then back south: An interactive map, with the rest area pinned: Our coach backing into a Coach Care service bay: We spent the day in the customer lounge: Second breakfast at Chick-fil-A: We parked our tuck behind the lounge, and turned on our smaller Bluetti battery, so we could use our truck’s Starlink Wi-Fi (the Wi-Fi in the lounge was not very fast): Our coach emerging: Parked for the night: Doing an engine regen: Heading out again, full of hope: We stopped at a rest area, to see if that triggers the issue, as it had before: Alas, it did: So we turned around at the next exit, and headed back to Cummins: We stayed the night again, then had Dutch Bros Coffee for breakfast while they looked at the coach again: And…