Questions tagged [emissions-testing]

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Evap System Leak, Repair and Clear Codes to Pass USA State Emission Inspection?

I'm aware of two related issues here Does Check Engine Light Clear Itself... I need the correct 2010 ... drive cycle steps to clear a “Permanent ” P0456 code I've just completed a particularly nasty ...
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1answer
33 views

Georgia Emissions Testing Missing Gas Cap “Evap Emission Control Sys Leak Detected (Small Leak)”

I lost the gas cap for my 2008 BMW 328i about a month ago. It took me about a week to get it replaced. During that time, the check engine light for my car lit up. I went out of town right after ...
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2answers
26 views

Converting emissions readings between ppm and g/km

Having taken my wife's 20 year old Nissan in for it's MOT test last week, I was looking at the results of the emissions test, and noticed that the Hydrocarbon reading was 6ppm - with a limit of 200. I ...
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1answer
46 views

Is this MX-5 running too cold, and could that explain poor emissions?

Last year my MX-5 NC struggled to pass its emissions test. 5 years ago I replaced the front cat exhaust manifold with a 4-1 non-cat manifold, moving the oxygen sensors around the remaining mid pipe ...
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1answer
54 views

I/M Readiness Test: How to know if I WILL pass emissions test?

My OBD monitor showed all as OK. My manual says that this means "monitor has completed diagnostic testing." During the emissions inspection, will the mechanic just plug a similar device into my car ...
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2answers
17 views

Star Smog Checks

I have an MR2 Spyder with 80,000 miles on it runs great but the check engine light is on and the smog technician stated that even if I reset the check engine light it would still not pass smog no ...