We saw and test-drove a VW Touran just under 3 weeks ago. There was a light on the dashboard, which I thought was the traction control light, and the ESP light near the gearstick was also on. The dealer said this was due to the battery being removed and replaced, which blew a switch, and it wasn't a problem but meant that the ESP light was always on. He said it could be fixed but most people didn't bother as it would cost £500-£600. The dealer gave us what we thought was a good deal, and I paid a deposit of £195 by credit card. He then offered to deliver the car once some cosmetic work was done and it was MoT'd, so we agreed to pay the balance (£6,600) by debit card there and then as he said he would not be able to deliver without that being paid in person. The following day I researched the ESP problem and discovered that not only was it common, but it could cost up to £1,500 to replace. I called the dealer to ask him to fix it. He offered our money back, but we still wanted the car and he agreed to take it for diagnosis. I now have a quote for the repair which is £995 + VAT. I don't want to pay an extra £995+ VAT. I have asked the dealer to get the problem fixed but he has declined saying I knew about it when I bought the car. What can I do?