What could cause the 2013 toyota corolla timing cover leak?

Owners of the 2013 Toyota Corolla were subject to a recall for an airbag. However, after replacement were told that their timing covers were leaking engine oil. The issue has become a common complaint, but remains unresolved in terms of manufacturer response. In most cases vehicles leak oil from under the timing cover due to a failed gasket. The cover is secured to the engine block by a gasket that becomes compromised from excessive operating temperatures, environmental stress, dirt and road debris. If the gasket cracks or fails, lubricant leaks will be observed. In the Corolla leaks may be undetectable as well if they are slow and less significant. The average cost to replace a timing cover hovers around $1,900 in parts and labor.