accord2002death Posted September 7, 2012 Share Posted September 7, 2012 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? Link to comment Share on other sites More sharing options...
Xeryon Posted September 7, 2012 Share Posted September 7, 2012 Is NV like OH where if you spend x amount of dollars trying to rectify your smog issues and still cannot pass you get a waiver? What engine codes is your car showing? Link to comment Share on other sites More sharing options...
accord2002death Posted September 8, 2012 Author Share Posted September 8, 2012 p-o4200 is the code and i already spent money on a new cat and lower sensor should i replace the upper sensor as well? and yes if i cant pass i get a waiver but i gotta spend another 300$$$ to even be eligible. i'm not made of money and the dmv isn't gonna give me any kind of break. i already got the 2 allowed temp registration for ten days a piece and now i gotta pay 8 bucks a day to drive legally. Link to comment Share on other sites More sharing options...
Xeryon Posted September 8, 2012 Share Posted September 8, 2012 Would you mean a P0420 code? That is standard accord speak for F U. Basically you need to replace all O2 sensors, catalytic converter, reset your ECU and pray. Bottom line: Accord engines are pretty high strung. The systems all function with very minimum allowable tolerances to produce the power they do with the ULEV emissions certification they have. As the engines age the whole system starts to break down and just produce more tailpipe emissions. Sometimes a shiny new cat and O2 sensors can get you by for a short time but the problem is more the engine than the exhaust and the light ultimately returns 6-9 months down the road. Link to comment Share on other sites More sharing options...
James Matteu Posted September 8, 2012 Share Posted September 8, 2012 Yes replace both at the same time. Your ECU judges cat' performance by collecting tailpipe data on both sides and comparing the two. Also be sure the EGR system is clean and you have fresh spark plugs (copper unless otherwise specifically designated). Copper tip plugs burn hotter, but the trade off is the tips wear out faster. So be Johnny On Time with the maintenance intervals. If you don't have distributorless ignition, check your coil resistance. Link to comment Share on other sites More sharing options...
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