We've had a few vis valves being faulty,there is probably loads of mg/rover vehicles running around with the valves innop,the customer wouldn't notice when driving.vis valves seem to be a fault code often.They were on back order last week,we had to get one of a scrap car.
There is no configuration for the valve,just fit em and go.Wiring is pretty good on those compared to a renault etc.
Is the p1674 a permanent fault?i will have a look tomorrow to see if i can find some info for you.
regards lee
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