As I said, sensible to check it out, but no need to panic. Amber warning light mean procede with caution, it's the red ones that mean stop and get it checked straight away. In the snow we are having at the moment (about 7 inches so far) my ABS light illuminated after a bit of wheel spin. No fault though, just that the snow confused ita little. Just remember that Fraud would love you to rush in and panic every time the slightest issue occured - at £85/hr + VAT it suits them very well! I recently had to change the coil on no 1 cylinder on my Zetec 1.8. The car was running like a pig, wouldn't pull and eventually went into limp home mode. This happened a few times after a couple of weeks of very occasional stuttering. At no point did the management light illuminate - it was quite happy to let me keep driving. Replacing said coil effected a complete cure. Now I think such an occurence should have illuminated the light but it didn't. Two years ago, I drove home from Leeds and the light did illuminate. No problems were ever found either then or since and there were no fault codes. I just think the light is so unreliable as to be fairly useless really. By all means check it out, but I for one, would take it with a pinch of salt UNLESS there were other symptoms as well.