Hi all. I've searched the forum and this seems a reasonably common problem, though more for diesels (DPF issues) than petrol. Mine's a petrol and the light came on Wednesday night. Fortunately it's still under extended warranty (just) and I took it to the dealer today. They said it's a valve on the cylinder (I forget what the cylinder's called) that is to the rear left of the engine bay as you look at it and its function is to reburn exhaust gases. There was no loss of power and little, if any, effect on economy. I've been doing research since Wednesday and this exhaust control system light seems to be triggered by a multitude of things - why is it so fragile/sensitive? I've had the Octavia for a year, and bar being rear-ended the day I bought it, I've enjoyed owning it and reckon it's all-round (due to performance, comfort, economy and carrying capacity) the best car I've owned. Being without the comfort of the warranty bothers me though - should I invest in another extended warranty?