Ok so i cleaner the plugs and ran it for a while with no success. I also cleaned all the connectors at the RCM and did no change. In the past the relay on my module would get carbon on the contact. Could a bad Relay control module work 3 oxygen sensors and not another? In other words could a bad RCM make just one sensor not work? I noticed a small burn on my RCM which may control the secondary inject pump but not sure