Hull City netted a consolation goal courtesy of Andrea Ranocchia in the 84th minute.
Guardiola has vowed to improve in 2017-18 but admits he is hugely frustrated that he failed to act on concerns he spotted in the 6-0 aggregate win over Steaua in the Champions League play-off round.
Guardiola's life in England to this point has been flecked with problems. In fact, it involved every City player on the pitch. "But at this moment all of us are focusing on our goal".
Hull's Ahmed Elmohamady put the ball through his own goal after 31 minutes to give City the lead on Saturday. Sterling looks to be contained on the edge of the box but he drops the shoulder and goes past three Hull defenders and crossing low for Aguero to finish. A rare goal on a rare start for Fabian Delph added the gloss.
Pep Guardiola has spoken out in praise of makeshift right-back Jesus Navas after Manchester City claimed a 3-1 win over Hull City on Saturday. In the 10 minutes we had a good chance to score as well.
Ahmed Elmohamady's own goal opened the scoring before half time at Etihad Stadium, as the Hull defender turned in Jesus Navas' risky low cross.
Up to that point, Hull had restricted their hosts to a long range efforts and set-pieces - the best of which saw Yaya Toure bring a flying save from Eldin Jakupovic. Claudio Bravo was back in goal for Man City, after some blamed Willy Caballero for the goals they conceded in midweek, but the Chilean did little to silence his doubters. City are unbeaten against promoted sides at home since 2009 and haven't been beaten by any side at home this season except "Champions-elect" Chelsea.
The deadlock was broken in the first half though, and by Hull, but unfortunately for the visitors it was an own goal.
Sane nearly added a third instantly, but fired Sterling's cross on the run straight at the goalkeeper.
That would have made it a flawless afternoon for Guardiola, but it was spoilt late on as Shaun Maloney cut the ball back for Ranocchia, on loan from Inter Milan, to steer a shot under Bravo's dive with the visitors' only effort on target.
Hull (4-1-4-1): Jakupovic; Elmohamady, Dawson, Ranocchia, Robertson; N'Diaye; Markovic, Evandro (Hernandez 58), Clucas (Henriksen 58), Grosicki; Niasse (Maloney 83).