A whirlwind start proved decisive as the Gunners scored twice in the first 20 minutes before holding the Foxes at bay, with goaltender Aaron Ramsdale in sensational form.
After losing their first three league games of the season, Mikel Arteta’s side have improved markedly, but it still had to be a tough test of their resurgence, against a Foxes side enjoying their own recovery in form.
Arteta was boosted by the availability of defender Ben White after illness as he named the same XI that started the win over Aston Villa last Friday.
It was White’s center partner Gabriel who opened the scoring as the Gunners showed off their new set-piece prowess, with the Brazilian returning home from Bukayo Saka’s corner in the fifth minute.
Less than a quarter of an hour later, the lead was doubled as Smith Rowe scored his fourth goal of the season at the end of a breakaway movement.
The Gunners had the opportunity to add a third, but Leicester improved as half-time approached and nearly cut the deficit in half, only for Ramsdale to save a James Maddison free-kick.
A double change from Brendan Rodgers, sending Harvey Barnes and Ademola Lookman, saw his side improve markedly after the break but they found Ramsdale too good on several occasions, while at the other end Kasper Schmeichel was keen for deny Pierre-Emerick Aubameyang a decisive blow.