ohhhh, lemme put my input
common things that happens :
-water pump leaks
-noise from timing chain cover are usually the chain.
-serpantine belt tesioner makes noise when loose.
-check engine light comes on maybe cause of VSV failure at tank by-pass, faulty pressure sensor and also dirty MAF sensor.
- and oil leak usually starts from timing chain cov er gasket.
these are usually the only thing that goes wrong with corolla, just make sure you change the air filter around 36000 KM or the MAF sensor get dirty and light come on.