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Singapore - Team engineers are nervous each time their cars approach Singapore's Anderson Bridge, according to a report in the German newspaper Bild.
It is said that a strange magnetic or electrical interference, probably related to subway lines that run nearby and underground, is threatening to grind the sophisticated, hybrid F1 cars of 2015 to a halt.
McLaren technical boss Tim Goss said: "The sensors are showing some odd numbers. If the cars get this electrical pulse during a gear change, it can disturb the workings between the throttle, clutch and gearbox."
As it happened: 2015 Singapore GP - Second practice
Bild said Mercedes, the world champion team, has built in some shielding against the interference.
But "We are still a little worried," technical chief Paddy Lowe admitted.