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    Posted by Eddie Ronayne on August 9, 2005, 4:48 pm, in reply to "Vauxhall Astra 1.7DT 2002 - Wastegate Regulating Valve Malfunction"

    ECUs give a fair bit of bother on these. Usually losing a 5v sensor supply.

    P1125 relates to the boost valve and can be either voltage high or low. You need to find out which it is.

    I don't have a diagram to hand for one of these but I suspect that it's fed with 12v from a relay. Bypass this and give it 12v from battery and see how it goes. The wiring over the cam cover is poor also.

    E.

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