Join Date: May 2007
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Hi, Well I sort of confirmed my suspicions a few times since starting this thread. If you don't reset the trip computer miles it will wrap round at 9999.9 miles. At this point the MPG display goes a bit wrong on my scenic. It always recovers after several more miles.
My guess it that the error is intoduced at that time.
Currently in phmilesc's garage:
Grand Scenic 1.9dCi 120 Dynamique