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In this video I show you how to diagnose an oil leak from the engine timing chain tensioner, applicable to the 2003 to 2011 Corolla. This problem is very common in these cars after a certain mileage. For those who wish to buy the part from a dealership, the code is 13540-22022. In the next video I will make, showing how to adjust the valves, I will be showing you how to install the tensioner.