Hey,
I replaced my dash about a month ago and since then I've had my service light on. Not my Check Engine light, if it was that one checker could pull it for me. I'd take it to a dealer but I don't have the money right now.

I cleared it by turning my car to on and off again 4 times and it cleared. Then it came back on.
Me and Josh (wojo) tried it again today and it cleared and held. We shifted thru the gears to make sure it wasn't anything there and nothing.
Then we revved my engine to the limiter, about 4000, and when it dropped back down to idle the service light came on.
Josh thought it might be the air filter so we checked it and it was dirty but nothing that would throw a code. So we took the air filter out to test, cleared it, it held off, and then revved it and when it dropped back to idle the light came on.
We tried this a couple times and it did the same thing.

Any ideas of what it could be??
And remember this showed up after I swapped my dash. Also, if I put my fuse in for the horn, it honks constantly. IDK if this has anything to do with the code or not.

I think we've taken out...
airbag
air filter
oil level (checked that today)

Things i'm ready to check..
fuel
fuel filter
something with the horn
wiring at bcm

-Seth