See Klaus' post for an explanation of how to get everything back on mark. One caveat though is that you might already have both cams in proper relation to each other and they could BOTH be out of time in relation to the crankshaft. That's what I did wrong, and as I recall I got the same fault code that you did. That darned crank timing mark is just not very definite. Also, when turning the crank to bring everything up on mark, always turn the crank in the direction that the engine runs. If you accidentally go a bit past the marks, don't just turn the crank backwards until the mark(s) align and then stop. Instead, turn the crank backwards several teeth past the mark, then start tuning the crack forward until you hit the mark. Always approach the mark the way the engine actually runs. If you don't, the spring-loaded tensioner can allow you to pull slack the wrong way in the belt, which can introduce a false alignment. If you don't quite dig this concept, try moving the crank shaft back and forth a bit and you'll be surprised how much it moves before the cam sprockets start to move. And of course, once you think you've got everything right, do as Klaus says and turn the crank two complete revolutions (the way the engine really runs) and make sure all three marks come back align together again.