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Old 09-08-2019, 04:04 PM   #1
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Not All Diesels Require Smog Test ?

In Nevada, diesel vehicle smog testing used to be 8,500 lbs. or less. Then they increased that to include 10,000 lbs. or less. Now, it is 14,000 lbs. or less, which obviously includes my AI.

From DMVNV website:
Light-Duty Testing
Diesel-powered cars and trucks need an annual emissions test if they have a manufacturer's Gross Vehicle Weight Rating of 14,000 pounds or less, and new vehicles on their first and second registration are exempted; a test is required upon a vehicle's third registration
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Old 09-08-2019, 08:07 PM   #2
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My gas 2500HD is not smog tested in NC and I thought that was a Federal, not a state, thing.

Window sticker from GM did not list gas mileage either. I think all heavy duty trucks are exempt, diesel or gas. Not sure this is helpful for you, but maybe it will bump the post to someone who can help.
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Old 09-08-2019, 09:26 PM   #3
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Originally Posted by Al U. Minium View Post
My gas 2500HD is not smog tested in NC and I thought that was a Federal, not a state, thing.

Window sticker from GM did not list gas mileage either. I think all heavy duty trucks are exempt, diesel or gas. Not sure this is helpful for you, but maybe it will bump the post to someone who can help.
AL U. MINIUM - thanks for this. It is kinda weird coz I thought all gas vehicles are smog tested nowadays. As far as my diesel Sprinter goes, its weird that just few years ago, same engine & gvwr would've been exempt but now it isnt. The direction NV is headed, in couple years, they would up the gvwr to 25,000 lbs.
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Old 09-08-2019, 09:37 PM   #4
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No smog testing in my Texas county (Hays), but there is smog testing, at least for gasoline engines, in neighboring Travis County.

Hays County is growing fast, but there is enough open space that it will hopefully be a while before the population density affects air quality enough to require testing. San Marcos, south of me, is one of the fastest-growing cities in the country.
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Old 09-09-2019, 06:30 AM   #5
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Originally Posted by Alex AVI View Post
AL U. MINIUM - thanks for this. It is kinda weird coz I thought all gas vehicles are smog tested nowadays. As far as my diesel Sprinter goes, its weird that just few years ago, same engine & gvwr would've been exempt but now it isnt. The direction NV is headed, in couple years, they would up the gvwr to 25,000 lbs.
There is no smog testing and no inspections required in many of the Midwest states for any non-commercially-owned vehicles, gas or diesel. Commercial vehicles and OTR trucks are, of course, subject to various inspections by DOT, but not smog.
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Old 09-09-2019, 08:27 AM   #6
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JOHN, 85MH325 - I asked a DMV rep who was helping me with a sale/transfer last week why the discrepancy and the apparent arbitrary weight changes with which vehicles are emissions/smog tested and she said (quoting from her handbook):

"Although the Environmental Protection Agency strives to enforce clean air practices nationwide, the EPA does not have the authority to enforce vehicle inspections. Instead, each state administers and determines requirements for smog and emissions testing."

Which explains why different states handle it differently and even within each state, some counties do not require it. I guess I just happen to luck out and every state I lived in requires it - AZ, CO, UT, CA, IL, IN, WI, NV
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Old 09-09-2019, 09:33 AM   #7
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Arizona does not require smog tests everywhere

We live in the outskirts of Maricopa county (Arizona). We are not required to have smog tests if we do not drive into the populated areas for work or school. I'm sure that'll change as the years go on.
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Old 09-09-2019, 10:43 AM   #8
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I haven't checked the DMV website lately but I believe the diesel smog testing was only required in Washoe and Clark counties. This may apply to gas vehicles also.
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Old 09-09-2019, 11:13 AM   #9
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I haven't checked the DMV website lately but I believe the diesel smog testing was only required in Washoe and Clark counties. This may apply to gas vehicles also.
RENOCLASSIC - For diesel testing, definitely Clark & Washoe counties only. For my gas vehicles since I moved here in 1999, Clark has been testing at least as far back.

I have 3 older vehicles in Classic Rod (20yrs), Classic (25yrs), and Old Timer (40yrs) status/plates and they rarely log 1,000 miles a year. They are exempt from emissions testing (up to 5,000 miles a year).
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Old 09-09-2019, 12:02 PM   #10
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In California, diesels don't require smog checks or certificates-although there are some confusing if/then rules. We've had three diesel trucks over the years and never had to do a smog check. Cars are smog checked but you pay an "abatement" fee for the first 8 years, then have to have the checked every other year after that.

Anyway, here if you owe the DMV something (money, smog certificates, whatever...), they will let you know. Your annual registration bill comes showing exactly what else you do need to include.
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Old 09-09-2019, 12:27 PM   #11
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Only the 3-4 large metro city areas in TX require testing, Houston, Dallas, etc. The rest of the state actually has their freedom un-infringed (is that a word).
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Old 09-09-2019, 12:37 PM   #12
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Originally Posted by Atwebs View Post
In California, diesels don't require smog checks or certificates-although there are some confusing if/then rules. We've had three diesel trucks over the years and never had to do a smog check. Cars are smog checked but you pay an "abatement" fee for the first 8 years, then have to have the checked every other year after that.

Anyway, here if you owe the DMV something (money, smog certificates, whatever...), they will let you know. Your annual registration bill comes showing exactly what else you do need to include.
ATWEBS - we lived in Silicon Valley for 10 yrs before moving to NV but did not own diesel vehicle then. I remember the "every other year" check. When we lived in Chicago, it was every year but the testing was done by the state smog stations, so freebie (at least at that time). I surprised NV & IL is stricter than CA considering CA set the stage for the entire emissions testing regulations to start.

The great thing about NV is the smog testing stations are just that, they only do testing and the computers are connected straight to DMV in real time. They are not repair facilities, so there is very little incentive for them to fail a good car just to make a quick buck. If they did, the trend line will quickly show in DMV. That happened to me in Cal where a facility tried to fail me, luckily I caught on to the scam.
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Old 09-09-2019, 12:41 PM   #13
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un-infringed (is that a word).
TBASHIN - you are correct, it is.
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Old 09-09-2019, 12:58 PM   #14
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Quote:
Originally Posted by Atwebs View Post
In California, diesels don't require smog checks or certificates-although there are some confusing if/then rules. We've had three diesel trucks over the years and never had to do a smog check. Cars are smog checked but you pay an "abatement" fee for the first 8 years, then have to have the checked every other year after that.

Anyway, here if you owe the DMV something (money, smog certificates, whatever...), they will let you know. Your annual registration bill comes showing exactly what else you do need to include.
Apparently those rules have changed, at least in Sonoma county which is just over the hill from you in Napa (I grew up there ). Anyway, diesel vehicles are now required to have a biannual inspection and the new vehicle grace period doesn't apply to them. I purchased my 2017 F250 diesel new and my latest registration just arrived with a requirement for a smog certification.
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