Group A heads into the final round of matches with all four teams clinging on to their Champions League dreams with just a point separating the quartet.
Celtic could not break down Bayern Munich at Parkhead while Hannu Tihinen's 69th minute header gave Anderlecht a home success over Lyon.
Arsenal forged ahead in Giuseppe Meazza on 25 minutes courtesy of Thierry Henry's precise finish but Inter levelled just past the half hour after Christian Vieri's shot deflected off Sol Campbell and the underside of the bar.
Henry turned architect after the break to create the second goal for Ljungberg to score from close range, despite a suspicion of offside, while the French international, Edu and Robert Pires added late goals to put a real gloss on the scoreline.
Lokomotiv Moscow boosted their prospects of qualifying from Group B after a thrilling 3-2 home success over former Soviet Union rivals Dynamo Kiev.
Maksim Buznikin slotted the hosts ahead on 28 minutes but Valiantsin Belkevich levelled the contest with a crisp finish on 37 minutes.
A controversial penalty, converted by Sergei Ignashevitch, gave the Russians the lead again on the stroke of half time only for Maksim Shatskikh to equalise midway through the second period.
Costa Rican substitute Winston Parks snatched a dramatic winner for Lokomotiv with two minutes of the contest left to leave his side dreaming of the second stage.
In Group C, Fernando Morientes' 34th minute header, which crept in at the near post, put Monaco in command and their task appeared to become easier when PSV's Theo Lucius was sent off early in the second half for two bookable offences.
But Didier Deschamps' troops shot themselves in the foot as first Vassilis Zikos was dismissed for two yellow cards, then Jan Vennegoor of Hesselink equalised, before Ludovic Giuly received his marching orders.
Deportivo La Coruna compounded AEK Athens' woeful Champions League campaign with a comfortable triumph at the Riazor.
Hector's fierce shot on 21 minutes broke the deadlock and second half goals from Juan Carlos Valeron and Albert Luque completed the Greek side's misery.
Real Sociedad fluffed the chance to join Juventus as qualifiers from Group D after letting their lead slip at Olympiakos.
Igor Gabilondo put the visitors ahead on 31 minutes but a goalkeeping error from Sander Westerveld enabled Ieroklis Stoltidis to draw Olympiakos level.
The Spanish outfit then had Darko Kovacevic sent off for two deliberate handballs and a second mistake from Westerveld provided Neri Castillo with the chance to put the home team ahead.
The advantage, though, lasted just three minutes when Gabriel Schurrer unleashed a stunning volley to leave Sociedad on the cusp of the next phase.
