Took my car to the shop...

Took my car to the shop...

So, I took my car to the shop for having cold start issues and I'm getting codes P0365 - camshaft position sensor B circuit (bank 1) & P054B - cold start exhaust (b) camshaft position timing over-retarded (bank 1).

After troubleshooting, they are saying that they want to replace both vanos solenoids (they are said I only need to do the exhaust, but its recommended to do both), timing cover gasket, valve cover gasket. They later told me that I needed to replace the impulse sending wheels, which I heard rarely go bad.

I found instructions on youtube on how to replace both vanos solenoids and it looks extremely easy so I'm considering doing it myself, but at no point did I see any steps on replacing either of those gaskets or impulse sending wheels so I'm just wondering what you guys think of this. I'm 100% confident that I could exchange the solenoids myself, but should I go the safe route and let them do all of the work?

2011 BMW 328i E90
47.5k miles

thank you for your time!

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Took my car to the shop...