Tom Pope's late equaliser earned Crewe a point and eased the pressure on manager Steve Holland.
There were calls for his head before the match even began and things got worse when Aaron McLean ignored claims he was offside to fire Posh ahead.
A fine Steve Collis save stopped Craig Mackail-Smith making it 2-0 and United had strong penalty shouts turned down when Shaun Batt was brought down.
But with three minutes left Joel Grant crossed for Pope to turn the ball home.
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Goals: Pope 88.
Peterborough: Lewis, Martin, Morgan, Zakuani, Williams, Whelpdale (Batt 63), Lee (Hyde 71), Coutts, Boyd, Mackail-Smith, Mclean (Torres 82).Subs Not Used: McKeown, Green.
Booked: Zakuani, Hyde.
Goals: Mclean 14.
Att: 3,699
Ref: Oliver Langford (W Midlands).
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