Located one on either side of the radiator on 2019 G4 US spec sedan these yellow ???s seem to have been detached while work was being done on the front clip. Unfortunately I don’t know what they are, what they do, or where they belong. Currently they’re dangling in the engine compartment. The one pictured is the one on the left side of the engine whilst facing it and the second black colored item in the photo is connected to the same wiring harness but not on the RH side one.

 

The yellow one is the G sensor for the Airbag system. This must be correctly orientated and torqued to correct tension to work correctly.

The black one might be a spare, possibly used for outside temperature sensor on some models

 

Thanks for the info. Where might I find the torque spec for securing these? I’d love to find a repair manual for the car or at the least a parts breakout. This is my girlfriend’s car but I’m the one that gets the call when there’s an issue.