Hi everyone. I am a new member today i hope someone can help me, i have a little problem with my car. Iv had it for a few years now with no real problems. Had to change the dis pack once but it has been perfect since. Just recently the engine management light keeps coming on and off and it makes a difference to the cars performance when it is on. I had a look on here and found out how to get the codes. I get 12, which i understand is the start of the sequence, then 16=knock signal circuit 1 and 19=incorrect rpm signal. Does anyone know what i need to do to fix this problem?? Any help would be gratefully received. Many thanks.