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You can always 1) buy a handheld for your truck type, plug into your truck's computer
and clear the fault codes out or 2) take it to someone who has a handheld that can
do the same.
If your mileage continues to deteriorate, my advice to you is to stop squeezing
pennies and take that Freightliner in to get looked over, especially if you are not
doing the all the maintenance at the recommended mile intervals. Clearing the codes
and then driving on a haul will either pop the engine light back up or it will end up
being nothing and the engine light will stay off. This may or may not be attributed to
your reduction in fuel mileage though.
Apparently, your an independent or your working for a cheap ass owner or transport
company. I used to drive for Werner's (many years ago) on a paper account from
Chicago to Philly to Atlanta (on the road for 26-28 days a pop with 2-3 days back
home) and anytime I had a check engine light go off, all I had to do was let my
dispatcher know and he took care of lining up my hitting a nearby truck shop, usually
after I dropped my load.
Anyhow, I would imagine that engine check light is telling you something, especially
with your mileage decreasing on a fairly consistent basis. Does not seem like
anything serious, otherwise you would have already had something significant
happen, but I would wager that your truck will eventually, in the upcoming near
future, need to be looked at by a certified heavy truck mechanic.
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