hello all sifu, my 2006 myvi "Check Engine" light appeared at my meter. it happened since last week but only for a 10 minutes of driving then the sign is gone, but yesterday the sign appeared all the way while im driving.reach home check all the sensor connections,all are still intact.i take off the negative terminal at the battery and leave it for one night.this morning started the car, and the "check engine" light is still appear. what is the problem on my engine?O2 sensor fault? im using RON95 and no mod at all on the engine.only the DIY oil catch tank..