https://docs.emtronaustralia.com.au/engine-management/config/channels/lsu-49-adv-lsu-49-comparison/index.htmlDifference between LSU4.9 ADV and LSU 4.9 Heater Power and Light-Off Times: The LSU4.9 Adv has a bigger heater element allowing the sensor to start operating sooner when compared to a LSU4.9: LSU4.9 ADV has a 8.7W heater - 5sec lite-off time from cold to start operating LSU4.9 has a 7.5W heater - 12sec lite-off time from cold to start operatingHugoen-us