Good point Dave, I take for granted everything is a WB heated Bosch these days. Todd > Count the number of wires on the sensor there might be either 3 4 5 or 6 > .. 5 or six can do better than 0.1 3 can not and 4 might if it is a > bosch '002' sensor. It is also a factor of how far the maps are from the > target value. > Dave