The stalemate leaves all to play for in Group H with two rounds of matches to play after table-toppers Ulsan were held 2-2 at Kawasaki Frontale.
Chinese champions SIPG, for whom Brazilian forward Hulk was a constant menace, came back from a goal down to lead 2-1.
But the 32-year-old le Fondre displayed his enduring predatory instincts to grab a classy leveller on 62 minutes.
The striker, who is at his ninth club and has had spells at Cardiff City and Wolverhampton Wanderers, popped up with a bullet header on the six-yard box.
"He's a fantastic person, first and foremost, and a fantastic player," said Sydney coach Steve Corica, who knows his team will almost certainly need to win their last two matches to progress to the knock-out rounds.
Corica, formerly a player at Leicester City and Wolves, was full of praise for the evergreen le Fondre, who moved to Australia from Bolton in August 2018.
"He's played in England, played in the Premier League, scored goals wherever he's gone," said Corica.
"He works extremely hard for our team and in the A-League has scored 16 goals (this season), and he's scored in the Champions League.
"He's been fantastic for our club and the way he's played this year."
Japan's Kawasaki Frontale gave themselves a qualification lifeline as they fought back from a goal down at home with nine minutes remaining to draw 2-2 with South Korea's Ulsan.
Leandro Damiao fired home an 81st-minute equaliser to revive Frontale's fading hopes of progress to the last 16.
Star striker Yu Kobayashi opened the scoring for the home side, but the Koreans struck back twice before half-time through Park Yang-woo and Junior Negrao.
Kawasaki piled on the pressure towards the end with Kobayashi guilty of the miss of the match in the second minute of stoppage time when he found himself unmarked with the goal gaping, but somehow hit the post.
Ulsan top a tight Group H on eight points, with SIPG on five, Kawasaki on four and Sydney still just about alive on three points.
Fabio Cannavaro's Guangzhou Evergrande were held to a surprise 1-1 draw by an under-strength Melbourne Victory.
The former two-time Asian champions dropped to second in Group F after Huang Bowen's 24th-minute strike was cancelled out by Jai Ingham's goal two minutes later.
Japan's Sanfrecce Hiroshima took advantage of the Chinese giants' slip-up to go top on nine points with a 1-0 win at Daegu FC in South Korea, courtesy of Hayato Araki's 34th-minute winner.
With Daegu just a point behind Guangzhou, Cannavaro's men now face a pivotal clash in Hiroshima in two weeks before the group finale against the Koreans on May 22.