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Seat Arosa failed NCT emissions


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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.
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Change your coolant temp sensor, fill it with super unleaded and use at least half of the tank driving around with a heavy right foot.

Does the car have any other engine mods?

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