A fortuitous deflected shot from Danny Drinkwater and a brilliantly-executed first goal of the season for Andy King on the stroke of halftime seemed to have put the Foxes in control after an early setback.
Salomon Rondon had become the first opposition player to score a league goal at the King Power Stadium in 2016 after just 11 minutes and, even when under huge pressure after halftime, Albion again proved party poopers when Gardner's 25-metre free kick left Kasper Schmeichel rooted to the spot.
Leicester could rue efforts from Jamie Vardy and Shinji Okazaki that struck the woodwork and Leonardo Ulloa almost equalised in the final second but the draw, which still leaves Leicester three points clear, gives Tottenham Hotspur the chance to overhaul them at the top on
Chelsea scored the fastest goal in the Premier League this season when Brazilian Kenedynetted after 39 seconds in their 2-1 win over relegation-threatened NorwichCity at Carrow Road on Tuesday.
Chelsea took the lead before some fans had even taken their seats when Kenedy drove a low left-shot shot into the far corner of John Ruddy's net from just outside the area after jinking past two defenders having been fed by the marauding Eden Hazard.
Diego Costa made it 2-0 to the visitors on the stroke of halftime when he clipped the ball over Ruddy from close range after being found inside the box by Bertrand Traore, although the Spain striker appeared offside when he received the pass.
It was Costa's eighth goal in his last 10 league games for improving mid-table Chelsea, who had to fight off a late rally by Norwich after the hosts pulled a goal back when winger Nathan Redmond fired a rasping drive into the net after 68 minutes.
Bournemouth beat south coast rivals Southampton 2-0 in an uninspiring match at Dean Court with the victory keeping the home side eight points clear of the Premier League relegation zone.
Fabio Borini scored a crucial stoppage-time equaliser to ensure Sunderland earned a draw which pulled them out of the Premier League relegation zone.
Results
Sunderland 2 Vs Crystal Palace 2Norwich City 1 Vs Chelsea 2Aston Villa 1 Vs Everton 3Bournemouth 2 Vs Southampton 0Leicester City 2 Vs West Brom 2