So I had issue with car stalling replaced MAF sensor and Fuel Pump Relay and seems like it fixed the issues, but check engine still shows "System Too Lean 1". Ordered Fuel Injectotion Relay. It will arrive on Monday.

And I noticed few wires/hoses disconnected near battery and front driver's side headlights. Any ideas what are those?

 

Headlamp wipers or adjustable beam headlamps, in other markets.

system too lean may be an air leak - check the small rubber connection to the intake manifold hidden by the power steering pump (if equipped)

 

air leaks - also check the vacuum tree under the throttle spool cover. there's a few branches that should be capped, and make sure the lines are not cracked