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
Hmmm do anybody know install AFR meter??
I ask at soem workshop they cost me RM80 wohh...
i hear some forumer say can DIY it..
I 1 install at waja 4G18 engine 1....
the afr hv 3 wire 1..
hope u guy can help me..