Why? Neither oil nor agriculture are large sectors as other parts of the californian economy, both contribute like 7% combined to the state GDP (1,2). Oil can be bought from elsewhere, it doesn't need to be extracted from the middle of residential neighborhoods in LA county like its the 1890s still.
Sure, but it's not like fossil fuels are the only way to power transport, although they're certainly the easiest way at present thanks to all the existing plant & infrastructure.
1, https://ajed.assembly.ca.gov/content/california-economy-2
2, https://www.api.org/news-policy-and-issues/news/2021/07/20/c...