Very helpful, thanks. The light doesn't come on when driving now, but 6 flashes when ignition is on indicates a troubled Lambda sensor. Does this mean it needs replacing immediately? Surely if it was that urgent I would have the CHECK ENGINE light on constantly?
Mine did exactly that twice before I got the Lambda probe changed, each time it happend I had the car at altitude >2400m, Ferench Alps, in your case I think that, but please someone correct me if I am wrong, the fault is no longer occuring but has been logged and will continue to flash like that until it gets cleared by someone with the Tech II kit.