Mainz s Karim Onisiwo, center, plays against Hoffenheim s Benjamin H bner during a German Bundesliga soccer match between FSV Mainz 05 and TSG 1899 Hoffenheim in Mainz, Germany, Saturday, Feburay.5, 2022. AP
Gladbach at least ended its three-game losing run across all competitions, but coach Adi Hutter remains under pressure with the team just two points above the relegation zone.
Bielefeld stretched its unbeaten streak to six games.
Janni Serra opened the scoring in the 19th when he eluded three Gladbach defenders and let fly inside the left corner.
The home team was by far the better side until Alassane Plea equalized with a diving header to Jonas Hofmann's lay off in the 38th.
Bielefeld also pushed hard in the second half, with visiting goalkeeper Yann Sommer rescuing Gladbach at least twice.
American defender George Bello made his Bundesliga debut following his transfer from Major League Soccer's Atlanta, entering for Bielefeld in the 71st minute.
But Gladbach might have grabbed a late winner, with Hofmann in particular failing to make more of some good counterattacking opportunities.
Marcus Thuram fired the last chance wide for Gladbach, which is also looking for a new sporting director after Max Eberl's decision to quit last week due to a buildup of stress and exhaustion after nearly 14 years in the job.
Union Berlin remained fourth despite losing 2-0 at Augsburg, which climbed out of the relegation zone with the win, and Freiburg remained fifth despite its 1-0 defeat in Cologne.
Cologne was without its coach Steffen Baumgart due to COVID-19. But it welcomed back 10,000 fans as authorities on Wednesday relaxed national coronavirus restrictions for large open-air events.
Ajdin Hrustic's second goal proved to be the winner for Eintracht Frankfurt which won 3-2 at Stuttgart, and Mainz beat visiting Hoffenheim 2-0.
League leader Bayern Munich hosted Leipzig later Saturday.
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