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how do i reduce exhaust emissions?

my car recently failed its mot for exhaust emissions how do i rectify this?(astra gsi 16v mark 3 redtop)
graeme, December 2007
it could be the catalyst needs replacing or even the lamda 02 sencor thats faulty??? hope this helps

andy m, January 2008
link Click here to see other fixes for Vauxhall.