After claiming an emphatic 3-0 win over Yeni Malatyaspor, the 21-year-old put his side on the path to claim their second consecutive victory but Eljif Elmas’ effort denied them the three points.
Onyekuru got the curtain raiser in the 66th minute after their hosts had been reduced to ten men with Ali Kaldirim picking his second booking.
The Nigerian international headed home into the far corner after connecting with Sofiane Feghouli’s cross.
In the 71st minute, Elmas grabbed the all-important equaliser to save his side from defeat in front of their home fans.
The on-loan Everton winger featured for the full duration of the game while his compatriot Victor Moses was replaced by Alper Potuk in the 90th minute.
With the draw, Galatasaray
They play host to Kayserispor in their next league game on April 20.