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P1540 - Opel Astra

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Opel Astra (G) 2004 1.6 CDE

Fault code 1540 lights up on the dashboard. Engin heat gauge stay lower than normal.
My aircon does not work and have not for the last two years and this is the first time my light came on.
What should I look at?

Vehicle: 2004, Opel Astra 1.6 CDE (G)

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