Att: Jrichker So I got codes 41 and 91, I replaced the 02 sensors and the code came back. I cleared the codes and now I'm going to trace down the problem before throwing money at it. I want to check the volts at pin 29 and 43 and make sure I don't have bad ground or broken wire. I noticed in a post here that you don't want to have the power on when checking the volts, will I need to disconnect the neg battery or just not turn the ignition on? also what are the volts that I'm looking for? The next wire I will check is the Hego wire it is now connected on the driver's side head (which is aluminum) with the ground strap from the firewall attached to it. I will check the connection first then relocate it to the back of the bell housing or intake for a better ground any advice on this would be great thanks.