Carlos Sainz Jr. says that Toro Rosso must improve its reliability if it is to stop missing out on points across the second half of 2015.
Sainz has collected nine points so far in his rookie campaign but has failed to finish the most recent three races due to reliability faults, which cost the Spaniard a probable fifth position in Hungary.
"Hungary was a much more positive race despite the reliability issue, the race pace was quite good, the second stint was also promising, a lot of the issues were resolved before Hungary," he said.
"But we need to focus on finishing races, if we finished the last few we would have picked up a lot of points.
"It was a stupid piece [in Hungary[ that costs one Euro [that failed], this thing which costs one Euro, I think it was probably not good quality enough."
Despite the circuit layout for this weekend's Spa Francorchamps unlikely to play to the strengths of the STR10, Sainz is nonetheless optimistic that Toro Rosso can score points.
"It might be like Canada, maybe Austria, where we were competitive but on the limit to make it to the top 10," he said.
"I’m confident we can still do a good weekend, make it to Q3 and a top 10 finish."