mustang2001

My 2001 gt has a check engine light on right after trying to start the car with the key without the chip in it. My scan tool reads that 4 heated o2 sensors have no voltage. I tried disconnecting the battery but it comes back after i restart the car. I find it hard to believe that all my sensors are not working. I dont want to bring it to a dealer because they will rob me. My warranty just ended too. I know my theft light was blinking rapidly but that stopped. Can cranking the engine with the wrong key do any damage? I tried it about 5 times till i realized i was using a regular spare. Help!!!

antiv6

do you have o/r exhaust. You say that w/o the chip it comes on.

mustang2001

My exhaust is stock except for flowmaster 40 mufflers. I also have Mac cold air pipe and filter. My light went on as soon as i used the correct key. Never had the light come on before. My mods have been on for 2 years.

M1ke

i think he is talking about starting the engine with his car key that does not have a micro chip in it.