ScufVZwags, get the codes scanned and ask to see the codes or ask them to provide the codes to you. If the code(s) is/are emissions/catalytic converters/post-cat o2 sensors related, you have 3 options:
- replace the sensors ( if they are confirmed to be buggered )
- replace the cats ( must be genuine Holden otherwise the light will come back on again as the o2 sensors will sense something is different and will get their mates ECU to turn the annoying warning light to come back on ). My cats were the culprit and I took a shortcut by putting an aftermarket cats there and the light did come back on!!! Please learn from my mistake!
- save your money if you dont wanna go with genuine cats, get aftermarket cats or even better replace the full exhaust system with a performance one and buy these "spark plug non-foulers"
please click on the link below if you not sure what they are. This modification is very popular in USA as their emissions law are really strict compare to ours in NSW lol. I wish I would've found out about this earlier, this would've saved me a LOT of time and MONEY.
Here is the link for more info on these "spark plug non-foulers" to trick your post-cat o2 sensors:
Custom Exhaust: Tricking the Post-Cat O2 Sensor - JDM Universe.com
As for myself I am going to get a cat back exhaust system done soon, and still weighing up the option of getting an ECU tune to disable the post-cat o2 sensors reading (not cheap) or do the cheap and quick fix as per the link above.
Oh one more thing guys, should I go with 2.5 inch single cat back or 2 1/4 inch dual cat back? Not really after a mad performance gain, just want to get a better noise from the exhaust when I "open" her up and not too loud when idling/cruising.
Any feedback would be appreciated!
