P0420 Non fouler passed smog test Hyundai Veloster √
2011 2012 2013 2014 2015 Hyundai Veloster 42002 Spark Plug Non-Fouler https://goo.gl/7jSmyS Installed a spark plug non-fouler on the O2 sensor(Oxygen sensor). It is the sensor after the exhaust manifold. Friend could not pass smog test. First he