When the creatinine level is lower in the urine test, it indicates people may have kidney problem. As the creatinine is mostly excreted by kidney function, and the damaged kidney function cannot excrete the creatinine out, which will cause the high creatinine level in blood and low creatinine level in urine.
Then, you will not damage anything if timing belt breaks. You simply need to pay for a new one to be put on. Also, the timing belt should last 105,000 miles.       Other symptoms may include engine vibration sometimes bad enough to set a knock sensor code.
Another symptom of a potential problem with the drive belt tensioner is unusual belt wear. If the drive belt tensioner pulley has any sort of issue it can cause unusual and accelerated wear on the belt. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break.