Onboard computer reset?

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Just had engine oil and filter change on our Skoda 1.9TDI using one of the drivein and wait outfits. Done the job OK but could'nt reset the 'oil service' due reminder on the dash. they said we need to go to main agent to have this done? Any advise on how I might be able to DIY this as I dont want an 40 mile round trip for such a piffling job. Thanks

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Thanks Eliot.

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Thank you Slinky, I shall give that a go.