hi all just got a Volvo s40 1.8 petrol and a newbie to the forum.I've had the car about three weeks now and the engine light came on after getting it the code is u1900,reset the system all is fine for a week then it comes on again reset then a week later on on it come again,same code u1900. any help and information would be most welcome so I can take it back under warrenty.Many thanks.
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