Mark Webber described the problems with his Red Bull in Hungarian Grand Prix qualifying as "stupid and embarrassing".
An electronic issue both prevented the car's KERS from working, and affected its gearshift system.
Webber still made it through to Q3, but Red Bull decided not to run in the pole segment due to the car problems. He will therefore start 10th.
"KERS, gearbox, you name it... driving the car so far off the potential is unbelievable and so massively frustrating," said Webber.
"It's stupid, it's embarrassing and it's a brutal circuit to be out of position.
"We should be challenging for the front row and we're bloody 10th. So, a pain in the arse.
"It's amazing... all the effort you go to and it's two weekends on the bounce where you get that."
Webber fears it will be hard to achieve much from 10th at a circuit where overtaking is relatively difficult - especially if the car issues continue.
"The team have got to get the car operating at the limit tomorrow," he said.
"It's a long race and things need to be functioning correctly.
"KERS was 50 per cent [of the problem] and there were other things.
"So we managed to tick nearly every bloody box in qualifying and made it hard.
"Hopefully we'll get that sorted for tomorrow, but it's going to be hard to get the result we should do."
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