Greeting Honda wrenches, Smog test results are as follows; 15mph> 111HC, .23CO, 551nox ¦¦ 25mph> 98HC, .06CO, 924NOX. The car is a California smog equipped fuel injected auto trans. Accord. The problem is high nox (924ppm)at the 25mph test speed. This number w... Login to read more.