Hello there! First time poster, recently bought a used 2011 L322. One of the only things that's not working are the parking sensors (seems like a common issue). The LED on the switch in the cockpit isn't turning on so I assume it might be the ecu. Recently brought it in for a service at the shop quoted me $600 to fix the ecu. Thinking it could be worth buying a replacement unit and giving it a DIY shot.

Any recommendations for the unit? Any watch-outs?

Appreciate the help!