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Old 11-05-2019, 04:25 PM   #1
kaitanium
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Default CA: Failed smog for an AOS??

what in the world. Thought aos was ok? Shop claimed "ANY" engine mods = auto fail. Any experiences? Thought my smog problems were only related to the turbo side of things (up and down pipe) Thoughts? Have the laws changed?
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Last edited by kaitanium; 11-05-2019 at 04:52 PM.
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Old 11-05-2019, 07:07 PM   #2
super_subie
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2020 STI
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i thought it was not, based on this document by BAR. Go to page 49.

https://www.bar.ca.gov/pdf/2017_Smog_Check_Manual.pdf
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Old 11-05-2019, 09:29 PM   #3
WRXnick16
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2019 STI CWP

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Modifying the PCV system or any other emissions control system is not allowed. You're pretty much limited to replacing things like the air filter, intercooler, catback exhaust, etc.. Almost anything in between is a no-no if it has any impact to emissions. There are some exceptions, but you still have to find a tech that's willing to pass you. Be prepared to take the document linked above with you.

It sucks to live in California if you enjoy modifying cars.

Last edited by WRXnick16; 11-06-2019 at 12:12 PM.
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Old 11-06-2019, 02:03 AM   #4
ItalianGuy
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https://www.saddleback.edu/uploads/a...nal12-2009.pdf

On Page G-6 continuing onto G-7 oil separators and filters do not require a CARB exemption, although I did have a problem with the first tech who didn't let me pass because of the same. I went back later and another tech had no issues with it.
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Old 11-06-2019, 12:13 PM   #5
WRXnick16
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2019 STI CWP

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Does your AOS retain the OEM PCV valve? You can't remove/alter that as it's considered an emissions control component.

The AOS must also remain a sealed system (can't vent to atmosphere).

Like the ItalianGuy said, it will come down to the tech. They can't possibly know every modification to every type of car, so some will either be more lenient or more strict when they see any signs of modification. Be prepared to reference the smog check manual.

Last edited by WRXnick16; 11-06-2019 at 04:22 PM.
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Old 11-06-2019, 02:04 PM   #6
subaru_gc8
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most smog techs arent the smartest bunch of people in the world. I would take it back and show them appendix G and tell them that the bar says its legal
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Old 11-07-2019, 02:57 PM   #7
kaitanium
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took the car to 2x stations, both failed. Ill check these options out. Thanks all!
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Old 11-08-2019, 11:08 AM   #8
shadowsports
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'17 STI LMT '08 LGT
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I just posted recently about this. Its why I returned my LGT to stock and bought an STI. There is no winning here. Your car can pass the sniffer and ECU tests all day long. Hell, many of my emission PPM's were not even measurable, but you will fail visual inspection period and it doesn't matter how well your car runs. CA SMOG Nazi's. This is a battle that cannot be won.

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