Hi everyone, have you ever got one of those without an EGR valve and fail Nox miserably? How do you go about it? Here is a 1988 Jetta 1.8L that failed Nox:

____________HC_____CO_____CO2_____O2_____NOx

40Km_______180ppm__0.4%___11%_____4.2%___2600ppm______p... Login to read more.