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sensor is bolted to the side of the engine just above where the gearbox joins it. It will probably be obscured from view by a coolant hose, but you can get to it.
Its a a curved peice of metal with a bolt at either end and an electrical connector going to it. What you want to do is get rid of all the little metal filings that is on the sensor.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo