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16806/P0422/001058 - Ross-Tech Wiki
You might try out some of the tests; in VCDS: (ageing testing, etc.)
VWVortex.com - VAG-COM procedures for testing the MAF, O2 sensors and catalytic converter
http://www.ross-tech.com/vag-com/m_blocks/030-049.html
Again, resolving the drivability and performance issues (fuel trims, etc); can affect others, as well. I guess, you can force the readiness settings and see what passes and fails:
Fuel Trim Info - Ross-Tech Wiki
Ross-Tech: VCDS Tour: Readiness
You might try out some of the tests; in VCDS: (ageing testing, etc.)
VWVortex.com - VAG-COM procedures for testing the MAF, O2 sensors and catalytic converter
http://www.ross-tech.com/vag-com/m_blocks/030-049.html
Again, resolving the drivability and performance issues (fuel trims, etc); can affect others, as well. I guess, you can force the readiness settings and see what passes and fails:
Fuel Trim Info - Ross-Tech Wiki
Ross-Tech: VCDS Tour: Readiness