my honda accord 1993 se fail smog to much nox what repair is needed

hc(ppm) max 61 meas76 test 15mph 25mph max36 meas 57 the ci max0.51 meas0.75 15mph 25mph max0.49 meas0.69

ok, a couple of things. with both the hc and co high, i would install a new o2 sensor. i would also change the oil and filter. that will increase your nox reading. i hate to say this but the cat is going to have to be replaced as well. it cannot process the gases and break them down. Roy

hi mastertech about my 1993 honda accord not passin smog could the intake control soleniod valve be a problem from not producing enough air

this will effect the mixture going tinto the cylinders for the perfect 14.7 to 1 air fuel ratio. it will not change the fact that the cat is worn out. Roy

mastertech you say that the cat is worn out,then why is it that my honda has no problelm driving 80 mph and starting right up?