Adrian Sutil had a dismal penultimate day in Bahrain as an engine problem kept his lap count down to one.
The Sauber driver headed out in the morning's session in the hope of developing his new C33.
But instead he can to a smokey halt on the side of the track, bringing an end to his day's running as - "as a precaution" - Sauber were forced to change the engine.
"This is why we are testing," said a pragmatic Sutil. "Of course I would like to drive as much as possible, but you have to look at the overall picture and the team decided to focus on and get ready for the final day of testing tomorrow.
"I would rather have these issues appearing here at the test than...
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