Having been in the wilds of the Highlands the last few days where the scenery is superb and some of the roads were pothole country, managed to grind the underside of the car on a rock - there is a score on the engine tray and I assume the cat got a thump as the exhaust light will now not extinguish - the car still pulls well, no fluid leaks and the water temp is rock solid at 90c. However it does feel rough from cold idle (though it has been rough for some time and I was going to dealer to get new software on to ecu to help this) Am I worrying about nothing or am I storing up problems by not getting it looked at. Thanks

May have damaged the Lambda Sensor on the CAT or the cabling to it.