2004 5.9, with 250,000 miles MIL lamp came on this morning after fueling truck

[J.Alexander]

my mil lamp came on after fueling and driving a few miles. I don't have a drb 3 code reader so that is out. truck is running good, mileage is about the same at 22+mpg. thanks to anyone who may help, J.Alexander

 

[Ozymandias]

Triple cycle the ignition key and your odometer will tell you the codes.

 

[Blu-meanie]

Look at your fuel cap not being on completely. Easy stuff first.

 

[Bob4x4]

Look at your fuel cap not being on completely. Easy stuff first.

The CTDs do not monitor the tank