Originally Posted by cainchapman
I would start looking at why you have such a high HC (hydrocarbon) reading. You are obviously passing through too much unburnt fuel.
Was the test dome while your car was hot? This does make a big difference to emissions.
As we manufacture units to do this, but don't actually need to test any vehicles, I can't really help. NOx (nitrous oxide) is a normal byproduct of Diesel motors.
It looks like you need to look at why it is running so rich and you should pass the test from there on.
well my car was warmed up. should i test it after a long day driving? would my results be better? i do have one free retest and i am willing to use it just to make sure i dont have to spend too much on other things