England made sure of only their second series victory in Australia after coming from behind to beat the Wallabies 21-17 in the third Test at the Sydney Cricket Ground.
Eddie Jones' side recovered in impressive fashion from a slow start that saw them trail 10-3 after Tom Wright's try.
The tourists hit back with Freddie Steward and Marcus Smith crossing, and they came under late pressure before securing another triumph Down Under, six years after their first.
England weathered a storm during the early stages; Noah Lolesio missing a first kick of the series before the right boot of Farrell put Jones' team in front.
The hosts soon established the lead that their early pressure deserved. Marika Koroibete's lay-off released Wright, who broke from just inside his own half and exchanged passes with Nic White before going over.
Lolesio booted the conversion and added a penalty, but England finished the half strongly. After Farrell trimmed the gap with a penalty, England edged their noses back in front at 11-10 when Steward crossed in the corner after a lengthy spell of pressure.
Farrell could not add the extras but stretched the England advantage with a penalty early in the second half, before Smith pounced on a poor lineout with a 55-metre sprint for the line.
Folau Fainga'a powered over 14 minutes from time to set up a nervy finish, but the tourists stood firm to seal the series.