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my accord wont pass smog?

4K views 4 replies 3 participants last post by  Darkness 
#1 ·
i got a 2002 accord 2.3 ltr 4 banger and i cant seem to get it to pass the smog test here in nevada. i just replaced the cat and the lower sensor on the car. and it is still throwing a code for the cat being bad. my question is do i need to replace the upper sensor as well?
 
#2 ·
the ecm compares what the first sensor reads with the second one, but the first sensor also plays a part in your fuel mixture. if your first sensor was bad then it should also be throwing a code

did you reset your codes after you put the new cat and sensor on?

if you did then i would think that maybe you have a problem with the connector where the second sensor plugs in, maybe a loose pin or corrosion?
 
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