Yet it can’t be used to stop California vehicle emission standards, which is why almost all car manufacturers in the US make cars up to California’s higher standards, because they’re so big.
In fairness, while I detest that California's laws become de facto national laws, it doesn't seem appropriate to use the commerce clause there. California isn't trying to regulate interstate commerce, it's not their fault that manufacturers are too cheap to have different models that meet California's standards while having a normal model for the rest of the country.