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Most probably the EGR (Exhaust Gas Recirculation system) is full of gunk, generated by the exhaust gas and breeder fumes and needs to be cleaned. Though it might be some other system that triggers this error. You could do the following to see if it can be remedied.
Check/Clean Exhaust Gas Recirculation (EGR) System
Check/Replace Exhaust Gas Recirculation (EGR) Valve
Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
It is likely this cannot be fixed easily and needs a full diagnostics and system cleanup at the Dealer/Skoda authorized service center. Might cost a lot since you probably need to remove the intake manifold, etc. to get the system cleaned properly.
You can read more about the code and the issue at ross-tech: 16785 P0401 001025
Its something wrong with air mass calculation , it might be besouse of exhaust gas recirculation faulty/dirty, some leaks at mainfold intake, wirring harness , becouse most of problems with skoda form 2005 to 2012 is with wirrings.
Octavia (a4 ) remove top engine cover the engine oil filter is at front cover, big black plastic cover remove with special tool the oil filter can be remove and replace with plastic ring
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