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You need to run a VCDS scan to find out. Find a good VW independent to work on the car and tell you.
 

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1) check your catalytic converter to see if it's clogged
2) check your O2 sensors. If the either sensor is weak, replace them both.
3) check your readiness codes with a VCDS. If any of the codes are no set, then you will not pass, but the test results should indicate if that's a problem.
 
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