Hi guys... As I have had the DC5R...for a week or so, i have been warned (before i bought the car) that the Check Engine light will light up due to the aftermarket full exhaust system (DCSport from header downpipe and exhaust).

I did bring the car to the garage, the mech said the O2 set the CEL light.

Does it harm the engine driving with the CEL on?

I am thinking of getting the new O2 sensor. do you know how much it cost in Australia? I am not getting it from Jpn, since Australia is closer and have a lot of friends and relatives there....

THanks....