Spark Plug for 4AGE BT 20v engine is IK20.
For further information, u may refer this website
http://www.globaldenso.com/en/products/aftermarket/plug/basic_knowledge/heatrange/index.html
The engine warning, TCS and SLIP lights all came out suddenly, and it also slow down the engine for you not to accelerate, jz good enough for driving home... Anyone can help???