Problem with a recently purchased used car

Bought an Insignia CDTI Elite 160 (used, 2009 58 reg). I have had it for 1 week.

The car has started to judder every now and again in 2nd/3rd at low revs. After using Google, this is now a known issue for Vauxhall (although many Vauxhall dealers are unaware of it still!) and my car needs an ECU update to rectify this problem. Should I be covered by my 3 month warranty that I got with the car? Or should I be covered with the actual garage I bought it from?

Asked on 5 July 2012 by Konya

Answered by Honest John
In UK law, has to be sorted out by the "supplier", which is the dealer who sold it to you.
Dear Honest John,

Please help me choose my next car. I would like it to have:
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