Inter Turku came from behind to score a 96th-minute winner at home to Ilves, who have now suffered back-to-back defeats to begin the campain.
Ilves had a tough start at home to KuPS, but the recovery mission looked to be going well midway through the first half when they were awarded a penalty, which Roope Riski thumped into the top corner to get off the mark for the season.
But the home side, frustrated in a goalless draw at home to VPS on matchday one, got themselves level in style in the 74th minute, when Loic Essomba's cross from the right wing was volleyed home by Alie Conteh - a memorable first goal for FC Inter from the new man.
And the turnaround was complete a whole six minutes into stoppage time, when an inviting Janne-Pekka Laine corner was met by 18-year-old former Inter Milan academy product Ilari Kangasniemi, who headed home his first goal for Finland's Inter.
A 3-0 victory over SJK on the opening weekend suggested HJK were back to their best under new boss Joonas Rantanen after such a poor end to 2025. More of the same was expected this afternoon after the Helsinki side named the same starting XI.
But they were rocked midway through the first half when Lamine Ghezali got free down the right wing and played a delicate cross onto the chest of Elias Kallio, who brought it down and struck cleanly into the bottom corner.
In response, HJK didn't create enough, with three shots on goal across the 90 minutes, none of which went down as big chances as Oulu held on for all three points - their second win of the campaign after thrashing Gnistan 5-1 in the opening round.
The reigning champions are also on maximum points after two rounds after they condemned Gnistan to a second consecutive defeat.
KuPS dominated the game with 75% possession and a total of 25 shots, but they were frustrated by their visitors from Helsinki who looked more resolute defensively compared to a week ago.
But their resistance finally broke nine minutes from time, when a deep corner was headed by Saku Savolainen back across goal to Jaime Moreno, whose half-volley gave the Gnistan goalkeeper no chance, leaving the visitors and Ilves as the only two without a point this season.