I've always had a left cornering light out. I replaced them tonight with Lunex H3 Supreme vision which promise up to 100% more light. I've never heard of this brand before but they were only £10 for a pair and come in a hard pack and seem like a quality item. Its kind of fiddly even with long nose pliers IMHO. When I put the headlights back on the Cayenne I was getting other bulb errors until I recalled that you have to turn the locking mechanism until it makes a loud snap noise and then all was well and I no longer have any bulb warnings.