Car Clinic: My Audi Q5 sometimes cuts out at junctions but auto stop-start is switched off

Q. The engine on my automatic Audi Q5 sometimes cuts out when I brake at junctions. My garage says the unit is fine and the stop-start is switched off. Any thoughts?

LC, London

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A. First, check the transmission fluid. If the level is OK, there may be a fault in the gearbox. Audi’s tiptronic automatic unit has a clutch (to avoid drag on the engine) and if it is slow to disengage, the engine can stall. On the S tronic unit, the clutch pack or flywheel may be worn.

Also, the engine may have an overlooked fault, so consult an Audi specialist.

TIM’LL FIX IT
Tim Shallcross used to train AA patrols to fix cars. Now he advises the Institute of Advanced Motoring — read more from Tim here.

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