Its your MAF sensor, Try cleaning it with the recomended procedures under the 30K maint. list. otherwise I had the same code about 5 months ago, ended up replacing the whole sensor. These tacomas are really sensitive when it comes to foreign matter on the sensor, basically the sensor works on electrical resistance, i.e. the more dirt, dust etc.. that collects the hotter the resistance and thus throwing a code on the computer, try cleaning if not replace.