Lehkonen, who helped win a puck battle in the corner that led to Johnson's goal, made it 3-1 at 16:57, deflecting a Toews slap pass past Grubauer's right pad from the top of the crease.
Colorado outshot Seattle 14-4 in the second period.
"I thought we played a lot on our heels tonight," Kraken forward Jordan Eberle said. "We didn't really play with pressure, and obviously a good team like that, they play with desperation, they are going to come at you in waves. We kept trying to find a spark and couldn't. We played a little too timid and you have a team on the brink, they are going to play with a lot of desperation."
Makar, back after serving a one-game suspension in Game 5 for interference on Seattle forward Jared McCann in Game 4, had an assist on Lehkonen's first goal. He added another assist when Lehkonen scored into an empty net with 12 seconds left in the third period for the 4-1 final.
"I feel like anytime we've had adversity this year, we've kind of just looked it in the face and said we're going to just take it one step at a time and go right at it," Makar said. "Huge character win for us and hopefully it gave a lot of guys confidence."
NOTES:The Kraken are the first team in NHL history to score first in their first six playoff games, surpassing the Toronto Arenas, who scored first in their first five playoff games in 1917-18. ... Rantanen (41 points; 18 goals, 23 assists in 34 games) became the second-fastest active player to reach 40 road points in the playoffs (Sidney Crosby, 33 games). … Makar (49) passed Sandis Ozolinsh for the most playoff assists by a defenseman in Avalanche/Quebec Nordiques history, most multiassist games by a defenseman (nine) and tied Ozolinsh for the most multipoint games by a defenseman in franchise history with 14. … Avalanche defenseman Josh Manson missed the game after re-aggravating a lower-body injury in the second period of Game 5 that caused him to miss the final 23 games of the regular season. … Dunn was the 14th Kraken player to score in the series. … Colorado finished 0-for-5 on the power play and is 1-for-17 in the series (5.9 percent). Seattle was 0-for-3 with the man-advantage and is 3-for-21 (14.3 percent).