Samppa

Hello, I recently bought a car that has knocklink g4 fitted in it and it's showing green most of the time, even when revving higher but when I'm driving steadily at 100kmh and about 2700-3000rpm its flashes red sometimes, I'm concerned because I don't want any damage to the engine. Any suggestions? The car is subaru forester 99' 2.0 s turbo. Also, the engine is running fine and there arent any unusual sounds when it flashes or anything