Removed them from my car, a 99 Camaro with a 2004 LS6 motor, with a 6 speed manual. After doing this I turned off U1040 and U1000, unfortunately as soon as I clear these codes the U1040 comes back, within a second or to. They were clearly turned out,

Engine DTC Mil Enablers
U1040 = "no Mil"
U1000 = "No Mil"

Engine Processing Enablers.

U1040 = X = "Not reported"
U1000 = x = "Not reported"

Yet the service engine light still comes on, with these codes.

Help would be appreciated.