Hi. I have a 1999 S70 an dthe ETS light popped on. I did some research, and removed the throttle body, completely cleaned the butterfly valve, venturi and throat. Re-installed and the light was out for a short time before it came back on-permanently. The car runs better than before, as it used to lope-the cleaning definetly fixed the loping. But, I still have'nt gotten the software upgrade. Question: Will the software upgrade make the ETS light turn off? Is that really all I need?
Thanks-