Need Help Bad! Mechanic cant find problem!

[PKRWUD]

I completely disagree with the idea of leaving your O2 sensors disconnected, but to answer your question, yes, if the wires became shorted, there would be a problem. It works something like this; The wire that sends a signal to the ECM could become shorted to ground, either directly or via the ground wire in the harness. This would send a signal to the ECM of greater than 1.0 vdc, which would cause the ECM to go into self test mode. The MIL would flash, and the engine would either stall, or drive poorly. If you insist on leaving the O2 sensors disconnected, you need to make sure that the wiring harness that went to them is wrapped and protected from anything that could cause a short to ground.

Take care,
-Chris