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Ok do you know if the battery was unplugged when the work was done ???
OK more then likely the basic seeing for the throttle body where lost when the battery was unplugged you're then likely have triggered throttle body faults thats why the eps light has came on , what will need to be done is have the faults erased and have the throttle body basic settings re-adapt it but this will need to be done with a vw capable scan tool a generic scan tool will not do it . I hope this helps.
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