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scenic cutting out?

I have A 52 PLATE SCENIC 1.6 PETROL AUTO.
Starts first time but on two occasions now it has lost power,cut out and taken 20 mins to restart.
Mechanic says it is a sensor on crankshaft dirty?
Help please,any suggestions welcome.im losing confidence fast!!!
Pete Walsh, June 2009
check exhaust valve tube from back of engine block to engine buk head it tends to split on the bend

adam, June 2009
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