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My 2008 VW Polo failed NCT thrice this year for emissions -Lambda high. In the first NCT ( 2900 rpm and Engine temperature - 86C) it had Lambda 1.08 ( Pass Range : Between 0.97 and 1.03). The mechanic checked and replaced the air filter. In the second NCT ( 3130 rpm and Engine temperature - 83C) it had Lambda 1.04 ( Pass Range : Between 0.97 and 1.03). On advise of mechanic injected fuel additive. In the third NCT ( 2730 rpm and Engine temperature - 105C) it had Lambda 1.05 ( Pass Range : Between 0.97 and 1.03). Please suggest what to do to pass the emission testing

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