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Timo Bernhard took over the lead of the Le Mans 24 Hours with three hours remaining following issues for the #1 Audi.
Tom Kristensen had been leading relatively comfortably for Audi, but pulled off the track to complete a power cycle having been down on power, losing 20 seconds before then pitting to try and get the issue resolved. Having been sent back out on track, it was clear that the #1 Audi was slow and Kristensen returned the car to the garage where it stayed for over 17 minutes as it required a turbocharger change and dropped to third.
That promoted Bernhard in the #20 Porsche in to the lead, with Andre Lotterer in the #2 Audi up to second and closing a 1m30s gap by an average of two or three seconds per lap.
Lucas di Grassi has taken over the #1 car but is now four laps off the lead and only two laps ahead of the #8 Toyota which continues to recover from a crash in the opening two hours of the race.
There was another lead change in the LMP2 class as Oak Racing regained the lead with the #35 Ligier after the #46 TDS Ligier had trouble and was lapping slowly. The two cars are separated by just a minute on track with three hours to run.
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Live text commentary recap of Hour 21: Key moments in bold
10:57 (UK Time)
Turner slides through the gravel at high speed after outbraking himself but continues. Such a shame that the GTE PRO battle fizzled out
Lotterer in the #2 Audi still closing in on the #20 Porsche for the lead, the gap now 1m11s
The #67 Porsche has beached it in the gravel at the Porsche Curves after it appears he was nudged wide by an LMP2 car
Lotterer in the #2 Audi comes across the line 1m22s behind the #20 Porsche, although lap times were similar on that last lap
A stop and go penalty for the #70 Taisan Ferrari for causing a collision with the #57 Krohn Ferrari down in the GTE AM class. Thiim still leads the class
Some slightly worried faces down at Porsche - the #2 Audi hunting down the leader is five seconds a lap quicker at this stage
Buemi in the #8 Toyota now two laps behind the #1 Audi and a place on the podium
The #1 Audi is back in the pit lane and on its way after a 17m30s delay - di Grassi heads out and is the best part of four laps down
Lotterer yet to bring the #2 Audi back in and he's 1m35s behind Bernhard in the lead #20 Porsche
The #1 Audi is still in the pits with the car requiring a new turbo. The #2 car had the same problem earlier in the race
Potential spanner in the works as my live text colleague notes "the clouds are looking a bit heavy overhead". 3hr30min to go
Indeed there was an issue with the pit stop for the #2 Audi and he's going to have to stop again soon
Here comes Bernhard and the #20 Porsche now leads the race with the #1 Audi still in the pits
In LMP2, the #35 Oak Racing Ligier is now back in the lead but Gommendy in the #46 TDS car was six seconds quicker on the last lap
Lotterer pits but it doesn't look smooth... No driver change and the #2 Audi heads back out
Di Grassi is getting in to the #1 Audi but it doesn't look ready to head back out on track yet. Bernhard is now on the lead lap and has a whole lap to complete to take the lead outright
Lotterer has done the fastest lap of the race with a 3:22.567 and he's taken TEN seconds out of Bernhard - the gap now 37s
Kristensen is back in to the pits, complaining that the issue hasn't been resolved over the radio. He's heading in to the garage, we could have a Porsche in the lead soon...
Kristensen dropping behind cars in the first sector, while we now have a slow Caterham out on track as Dyson in the #42 car crawls along the Mulsanne
Kristensen lost 20 seconds on that lap but any issue seems to have been cleared after a quick pit stop... no he's still slow!
Bernhard pits from second place in the #20 Porsche and stays second but has Lotterer closing him down in the #2 Audi
Looks like Kristensen stopped to do a power cycle and after starting to move again he looks to be up to racing speed
Kristensen has stopped on track! The race leader is stopped at the start of the Mulsanne
After their problems this morning, that could put the #35 Oak Racing Ligier with Shulzhitskiy at the wheel back in the lead
Looks like a suspension issue for the #46 TDS Ligier as it slowly makes it back to the pits with a smoking front left as it rubs against the bodywork
The #12 pits and there's a problem for the #46 TDS Ligier which leads LMP2! Gommendy is at Arnage with an issue with the front left