I have recently purchased a second hand 2008 BMW Z4 2.0 Sport with 35,000 miles on the clock and a full BMW service history from an independent dealer. After two weeks and doing a weekly trip of 300 miles the emissions light came on. I took it back to the dealer who had a quick look and reset it (bogus readings, he said).

After a few weeks later it came back on again – but with a slightly different error code (still exhaust). Then last week (just before my three month warranty expired) it came on again for the third time. Of course I went back to the dealer and said fix this problem.

He took it to BMW on my behalf and they have diagnosed it with a failing catalytic converter 1st bank (I think these engines have 2 – N46 engine). The dealer has told me I am not covered under the warranty on this part. He has been quoted £1200 to fix it and will make a £350 contribution towards this.

My question to you – this was a developing problem during the warranty period – should he pay for the whole thing? Or is he being more than generous by making a contribution?