[Phantom]

Also I did not catch the year of the car but if it is over 7yrs it is probably a good time to replace the O2 sensor they tend to get lazy as they get older and richen the mixture thinking that it is ok. Although the O2 could last longer than the US version since the Aussie version of the 3800 use one O2 per bank and the US gets exposed to both banks for one O2 (I disregarded the post cat O2 since that one does not matter).