A while back we sold my wife's car - 2000 Legacy Outback - 2.5 and automatic 341,000 miles - to a local guy. He's trying to get it smogged and it failed it's first attempt. Gas limit at idle is 100ppm and the car was at 300. At 2500 RPM it was down to 166ppm but the limit is 130. He's a younger guy and not super versed in Subaru yet, so I offered to help as much as possible.
I have no prior experience in helping a vehicle get smogged. Hoping some of you would have some ideas on what to do/where to start. There's a twin to this car in a Pick N Pull close by so i've got some access to replacement parts if need be.
Thoughts and ideas on what can help it pass?