My emissions warning light came on a couple of weeks ago, i took it into my local vauxhall dealer who said it was my lamba sensor. I had that replaced and a week later the light cam on again!!So the garage have had my car for a week and have replaced my ecu and said have the car for a week to see if that resolves the issue. But on taking collection of the car it now sounds like its pinking but it only does it when underload at around 4000 - 6000rpm. I was wondering if anyone had any ideas as to whats happening to my beloved astra coupe turbo.