Daniel Johnson gave them the lead with an 89th minute penalty but Coventry pegged them back with an equaliser from Jacob Tavares in the seventh minute of stoppage-time.
It was so frustrating for the Lilywhites, some of the added-one time due to two home fans running on the pitch between the award of the penalty and Johnson scoring it.
Here are the PNE player ratings from the game, with defender Sepp van den Berg taking the starman award for the visitors.
5. Brad Potts 6
Was on tghe back foot early in the game as Coventry had the better of that spell but came more into the game in the second half. Photo: Mick Walker/Camerasport
6. Ben Whiteman 7
Played his midfield role well although did give away a couple of free-kicks. He was keen to get on to the ball to get PNE playing. Photo: Press Association
7. Alan Browne 7
The skipper was involved in a couple of counter-attacks in the first half and was a key part of North End’s forward play in the second. Photo: Camerasport
8. Daniel Johnson 7
Shaky start with his passing but got a lot better. Played in Riis to earn the penalty and kept his cool to score from the spot. Photo: Mick Walker/Camerasport