common problem is not enough travel for linkage on th lH side. When the sensor arm moves forward it hits the frame brace. Take a grinder and cut back so as to let poteniometer arm travel froward more. Then reset linkage. Try to get the lH to match the RH and they work better for some reason. 1.8 to 3.8 is ideal in the real world. Press and hold header icon til the 'error code' shows then quickly push the up down arrow and it will show lH sensor voltage, then min and max the RH etc as you scroll through the linkages.. The quickest way is to hook a VOM to the panel to the Right behind the seat. Once set, this is a super system. Again, check out the lH frame obstruction, the new ones are notched from the factory as of this months shipment.