We already have Chinese phones, applications, computers and networks.
I don't believe cars are not a meaningful attack vector relative to the economic benefit. Tiktok is a far larger threat.
The trade disputes related to Meng Wanzhou are nothing in comparison to what the US is doing right now.
I don't see that happening outside of an outright war with China. I dont think that's very likely. If you have evidence of them doing stuff like that already I'd be open to changing my mind on the topic.
I think it's much more likely they'll just continue buying up our companies like Husky and trying to turn us into an economic puppet state. Which is still better than the stated American alternative of being the 51st state.
They lose that power and risk nationalization of their assets if they go too far. They know that.