in the dignostics under EO1 address 22 is lH sensor and 26 is RH voltage must be between .5 and4.5 to cal. when on the ground. also there os three wires that hook together as a identifier at the plug were the header plugs in. just setthe header down and check those adresses for the proper voltage and adjust to the range if that dont work check the idetifier wires there is diff setttings for a 1,2 ,or 3 sensor system