[psalt]

Bill,

You are shooting in the dark without actually testing the duty cycle. You need to determine if the ECU is pulsing the FV in the correct range open loop and dithering in closed loop. The open loop operation (cold and WOT) cannot be tested at the O2 sensor. If your new O2 sensor produced 0.1 volt with a low 3 bar control pressure, about all you can say is the sensor is not broken and it is lean when it should be rich. Is it lean because the ECU is not pulsing the FV correctly ? The unheated narrow band sensor in an SC is not very accurate away from 0.5 volt and should be viewed as a switch. Have you tested the main temperature switch on the right timing chain cover ?