Recently I did a Cat-Delete. I have to go back to the muffler shop since the CEL turned on, I am guessing O2 sensor is reading too much since the catalytic isn't there. But sometimes when I am at D5 the VTM-4 light comes on and disengages my AWD causing from tires to spin if I accelerate too much. If I turn off the engine off then back ok the light will go off an AWD keeps working! Any tips of what could be causing this? Appreciate your help folks!