High vehicle registration fees was one of the major factors in the recall of Governor Davis back in 2003. It may have been just as big a factor as the electricity crisis. Voters really don't like seeing their car registration fees go up.
Just rumors of this happening are probably enough to impact sales in the USA's largest market.
You could do the same with natural gas furnaces. Put an excise tax on new ones and a program to help people to replace their old one with a heat pump.
This is better because the impression people would get is the state trying to help them do the right thing vs the beat poor people with a stick like carbon taxes do. (See France's Yellow Vests)
Everything gets more expensive and has the potential to effect even those who are in poverty who work those jobs as the employer can't afford extra employees due to the extra cost in trucks. Leaving a group of potential workers without employment.
You also negatively affect those who want to start a business (landscaping, catering, delivery). They now have to raise even more money to begin.
Regulations have downsides that may not be immediately apparent. California is already so stupidly expensive because of regulations it doesn't need to force it though. There is nothing stopping the manufacturers to continue being clean?
https://ballotpedia.org/California_Proposition_6,_Voter_Appr...
I'm in Silicon Valley and I see large SUVs and pickup trucks and gas-guzzling performance cars everywhere I look. In the rest of California there are even more SUVs and trucks.
...Vehicles that are currently illegal in California due to stricter emission control? (Unless I'm missing something...)