03-17-2018, 07:37 AM
California requires many extra pollution control electronics and Ariz - N.M. and Hawaii do not .
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It was generally minor differences. Not to be concerned about over the last few years.
Things changed in 2007 when 4 other states started using the CARB standards and then you had some 45 state emission legal vehicles. If I recall, VW diesels of the time were in this group. In 2009 it went up to 14 states and most recently AZ also adopted the standards. In 2016 the EPA has matched CARBs standards and CARB began to collaborate on the standards for the rest of the US from 2017-2025 with the EPA.
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It was generally minor differences. Not to be concerned about over the last few years.
Things changed in 2007 when 4 other states started using the CARB standards and then you had some 45 state emission legal vehicles. If I recall, VW diesels of the time were in this group. In 2009 it went up to 14 states and most recently AZ also adopted the standards. In 2016 the EPA has matched CARBs standards and CARB began to collaborate on the standards for the rest of the US from 2017-2025 with the EPA.