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Originally Posted by BBC

But Red Bull boss Christian Horner insisted the team had complied with the regulations, adding that the fuel sensors have caused problems since their introduction.

"I'm extremely disappointed, quite surprised and we will of course appeal," said Horner.

"Hopefully through the appeal process, it will be clear the car has conformed at all times with the regulations and we have complied with technical regulations.

“Since their introduction, there have been discrepancies and the sensors have been unreliable”

"We could see a significant discrepancy with what the sensor was reading and what our fuel flow was stated as - that's where there's a difference of opinion.

"These fuel-flow sensors, which have been fitted by the FIA to measure fuel, have proved problematic.

"Since their introduction, there have been discrepancies and the sensors have been unreliable."

Horner said they had an issue with the sensor "through Friday practice" and were given a replacement that "failed during qualifying".

"We were asked to put the one we used on Friday back on the car and apply an offset," he said.

"We could see a significant discrepancy with what the sensor was reading and what our fuel flow was stated as. We didn't feel it was correct."

Story here -
http://www.bbc.com/sport/0/formula1/26601418