Renault eDAMS chief Jean Paul-Driot says the team still hasn't discovered the reason for Nicolas Prost's rear wing failure in the first race of the new Formula E season in Beijing.
Prost was in third place and closing in on Lucas di Grassi when his rear wing partially collapsed in the closing stages of the race.
He was shown the black-and-orange flag for safety reasons, forcing him to abandon the race despite his pace not being seriously affected.
“We are not happy about what happened to Nicolas in the race,” Driot told Motorsport.com. “We had the same issue here at Beijing with Buemi last year. It looks very similar to that.
"We then had a procedure in place to cure it, but we don’t know right now why [the rear wing] went. The rear wheel bumper went first and after that the wing came down.
"We could have carried on, as it was not moving so much but we got the orange flag and that was it for us as you can’t take big risks."
While Prost's early exit from the race was a negative, his team-mate Sebastien Buemi was able to pull off a dominant win from pole position, and Driot hailed Renault’s single motor powertrain solution for being instrumental in the victory.
“Efficiency wise we are very happy and we hit all targets,” Driot said. "We have had no reliability issues and that is good because it was a big question mark with all the new equipment.
"We are satisfied with the performance as you have to say the win, pole and fastest lap by such a margin is a big reward for the big push from Renault and the whole team we have around us.
“Overall, we are highly satisfied with the performance of the new powertrain, but Malaysia will be a big test with the temperature, there will be additional question marks."