Iâ€™m having v-tec problems with my h22 accord and I need to know the following. 1 I just pulled a code and Iâ€™m getting a code 12 which is the Egr valve could this be a possible reason. 2 My tach does not work, Iâ€™m not sure if itâ€™s the tach itself or the blue wire on the dizy is not getting power. Would this affect my vtec? I need to know specifically if the tach is getting power but simply not working would it matter, or does the tach actually need to show the RPM in order to work? 3 The Egr valve is on the manifold correct right behind the oil cap.