High NOx at e-test lane

if your temperature gauge never shows more than 1/8 then you could have a problem of your car never getting fully warm or thinking that it never gets fully warm. since your heater works then it probably just thinks it's not warm. your car needs to run richer when it's cold to compensate for denser air, if it never thinks it gets warm then it won't even change the fuel ratio based on the oxygen sensors. check your coolant temp sensor and make sure that your egr is working. either one of these could be a cheap fix.