ok. i grew old school so i need some help from computer guru's. i had a mail order tune done on my car and had the o2 sensors deleted. but my car throws a code every so often and when i check it, it says that there is a bad o2 sensor. why would this happen if they are deleted? and how do i fix it, because i notice significant power loss when it throws the code.

 

Please post the exact code number so people can understand what the real problem is. If you are referring to the 94 that is in your sig, I don't see how you could have had any O2 sensors deleted. It only has front O2s and they must be there for the engine to run properly (or you have done an OBD-II conversion you are not telling about). Please supply any details that might be missing.

 

.... or he's running an open loop tune.

So little info to go by.