I have a check engine light and three codes that I have erased a few times but they keep coming back. Two of them are are 02 sensor bank 1 and 2, downstream. So, I removed the rear most 02 sensors and cleaned them and reinstalled. I figured I have nothing to lose by trying that. I will order new sensors if this doesn't work. The final code is electric thermostat circuit fault. Any idea what that means? Do I need to replace the thermostat? Is there any testing I can do on the circuit itself? The temp seems fine and the coolant level is fine. Thanks.
Silver Rover
2004 Range Rover HSE
Silver Rover
2004 Range Rover HSE