Fuel cell controller
This chip controls the flow of power into a car's electric engines. Many drivers quickly burnt out this chip through frequent rapid acceleration. Still a valuable part to have -- if you only had a car to install it in.”
Skeeter at Gecko's junkyard has it. He can be traded a super tool kit for it (reward from the quest Deliver pliers (tools) and a wrench to Valerie). Alternatively, it can be stolen (impossible after the patch), or killing him.