Our EPA is out of control and people and companies need to speak up. I'm sick of the greenie enviro-terrorists. I've deleted everything possible on my diesel vehicles as protest.

Just wait,they've been testing others and all have failed including Jeeps.You may get stuck having a emission complaint CRD soon if you want it or not.

That's fine. We voted the borough emissions testing out of interior Alaska several years ago and ever since then we have been attacked by outside enviro-nazis who bring outside money into Alaska to finance huge movements like "PM 2.5". These clowns are attempting to give state and ultimately federal control over home heating! Until people get tired of the BS and fight it, it'll just keep getting worse.

The only people I know of that don't seem to have a lot of exhaust systems failures are VW drivers........now we know why.

Any test is going to have to be a standard that's repeatable. Hence you have to do it in a shop, the way emissions are tested in the USA. Doing it onboard, on the road, in real world conditions isn't going to work because you're never going to get repeatable results from one car to another, from one location to another, from one environmental condition to another, etc. So while you can test for actual emissions a car is putting out, there's no real way to legislate that, or for any locality to make it a valid test. I don't see anyplace going to on-road emission testing easily unless there's a pretty wide variance.

.

I may not be expressing this well but the issue is not whether a vehicle meets emission requirements "on the road" as that is not the basis of the testing environment. Rather the issue is do vehicle emissions in the "dyno" testing environment mimic as accurately as the testing environment assumes for on the road emissions. In the case of the VW engine(s) in question the answer is NO because VW was "faking" emissions in the testing environment. Personally I strongly suspect real world on the road emissions will not, in many cases, match testing environment emissions. One may debate how close they should match and the best I'll say is they should be reasonably close not the 40x or so difference seen in VW.

VW's problem is they thought they could meet the post 2006 model year emission requirements without add-ons other companies used. Apparently the answer was a resounding no and someone(s) at VW decided to cheat. Why they continued to cheat as long as they did somewhat escapes me but I assume it's because once a lie is out there it's hard to take back.

Diesel emission requirements for model year 2006 and early were much different and to a large extent somewhat irrelevant to the computer cheating issue never mind the age of the vehicles in question and the design life of emission control systems.

My personal bet, setting aside how the VW issue at hand plays out, is the long term result is likely to push new vehicle emission certification testing out of the "dyno" environment and onto the road now that testing equipment is more portable.

They do roadside sniffer tests(gas only) in Denver,they even advertise the locations and if you pass like twice or something your set so no smog station for hours.

They do roadside sniffer tests(gas only) in Denver,they even advertise the locations and if you pass like twice or something your set so no smog station for hours.

Even roadside tests cannot determine throttle position and engine load.
.