Posh looked set to fall to an undeserved defeat when conceding a 90th minute goal to a shot from the halfway line, but substitute Matt Garbett popped up to make it 2-2 in the 94th minute.
It was a reward for another hard-running display under new manager Robbie Savage.
RATINGS KEY: 10-Out of this World, 9-Outstanding, 8-Very Good, 7-Good, 6-Okay, 5-Poor, 4-Stinker.
5. JOSH FEENEY
He was hurried more in this game than any other he's played. A solid defensive effort though - 6.5. Photo: DAVID LOWNDES
6. LIAM KELLY
An all-action midfield display of tackling, passing and prompting. Only disappointment was a couple of second-half shots at goal from good positions - 8. Photo: Joe Dent
7. HARRY ASHFIELD
Impressive work-rate and energy levels until his substitution. One first-half shot was well saved - 6.5. Photo: Joe Dent
8. ETHAN WILLIAMS
The man doesn't stop running. A mixed bag of outcomes. A cross that should have been converted was his best moment. Looked knackered well before the end which he finished on the wing - 6.5. Photo: DAVID LOWNDES