I have a 98 civic ex. I changed the cat. converter (due to a dtc) and cleared the obd sys. The next day the obd put up a p0133 which is bank 1 sensor 1 slow response. so I changed the sensor. The light came on again with the same code. So I changed both the sensors with new ones, checked the wiring, cleaned the maf, tightened the exhaust bolts, checked for vac leaks and the light came on again with the same code... Any input is appreciated. thx