Florida (2-1-3) is off to its best start in franchise history and a surprising early leader with Washington in the new Southeast Division of the Eastern Conference.
The Panthers, who outshot Washington 33-20, led 1-0 in the first period on Jaroslav Spacek's first career goal.
Washington (3-2-2) tied it on a second-period goal by Joe Juneau. Viktor Kozlov scored 4:35 into the third period before Washington tied it again on Johansson's slap shot.
The Panthers got a point Saturday despite coach Terry Murray's decision to bench Robert Svehla and Ray Whitney after the Panthers were beaten 5-0 by Vancouver in Florida Friday night.
Svehla, who had only missed four games in his last three seasons, and Whitney were two of the Panthers top three scorers last season.
Florida was already minus the services of injured veteran scorers Dino Ciccarelli (back) and Scott Mellanby (groin).
Washington was far from full strength Saturday also with Michael Pivonka (shoulder), Jan Bullis (ankle), Steve Konowalchuk (ankle), Richard Zednik (shoulder), Joe Reekie (foot) and Andrei Nikolishin (holdout) all missing.
Spacek, the Panthers' fifth round choice in the June draft, scored on a power play 6:09 into the game.
Washington has survived 22 of its last 23 shorthanded situations before Spacek's goal. It was Florida's first goal in the first period this season and the Panthers' first power-play goal in 15 opportunities.
The Capitals managed just nine shots in the first two periods against Panthers goaltender Sean Burke.
Washington goaltender Rick Tabaracci made his first start of the season in place of Olaf Kolzig who shut out the Buffalo Sabres 1-0 Friday night.