My 2004 4runner had to have the drivers side cat converter replaced. I did that which cleared the codes. Then I had to do a zero point calibration to get the trac and vsc lights to go off. Now the 4 wheel driver doesn't work. Any ideas of an easy fix and or suggestions? When four wheel drive is engaged the lights just flash. I hear it engaging but it doesn't work. Also when I try to put it in low it just beeps and the vsc light comes on. To reset the lights I have to turn the car off and restart it. There are no current codes at this time. Any help would be greatly appreciated.