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Sebastian Vettel's title hopes look set to take yet another hit, after a bizarre post-race incident in Malaysia.
It had already been a horror weekend for Ferrari, with Vettel starting the race from the back of the grid and Kimi Raikkonen not starting at all with a near-identical turbo issue.
Bad carbon pipes
Germany's Auto Bild reports that the problem may be a bad batch of carbon pipes.
It all means Vettel's points deficit to Lewis Hamilton blew out by a further 6 points, despite a stunning drive through the field to fourth by the German.
But team boss Toto Wolff nonetheless called Malaysia "painful" for Mercedes.
Wolff said: "We didn't have the pace to challenge Red Bull or Ferrari.
"We need to get on top of why we underperform on certain circuits."
But Mercedes' weekend was not nearly as bad as Ferrari's, with Vettel almost running out of fuel at the end before he got involved in a bizarre post-chequered flag crash.
'I'm not looking in the mirrors'
Vettel said: "I think he just didn't look," after hitching a ride back to the pits on the sidepod of a rival's car.
Vettel was referring to Lance Stroll, but the Williams driver was not willing to take the blame for the crash.
"The race was over, so I'm not looking in the mirrors," he told Bild newspaper.
The big fear now is that Vettel's gearbox may be damaged, which could cost him a five-position grid demotion this weekend in Japan.
Vettel said the rear of the car is "very damaged".
As for whether he will take a five-place drop at Suzuka, he answered: "I don't know. We'll find a way.
"It's not my fault if somebody crashes into me."
Indeed, it is believed that Ferrari immediately asked the FIA for special dispensation due to the bizarre nature of the post-race crash with Stroll.
It is also believed that the FIA said no dispensation would be granted in the event Vettel's gearbox needs to be changed.
Niki Lauda, the Mercedes team chairman, blames Vettel.
Lauda added: "To be polite, crashing after the race is not good. Why is he overtaking after the race? There is no reason.
"Ok, maybe the fault is with both of them. But it could be a more of a problem for Sebastian in Japan."