Just had my 98 seat arosa in for NCT and failed due to emissions. Readings were lambda...... 1.04 (not between .97 and 1.03) CO........ 0.47 (above .30%) HC....... 324ppm (above 200ppm) This was on retest and between tests i had fitted a whole new exhuast system complete with catalytic converter. Does anyone know what these readings mean and how i might fix the problem.