The Scrapyard Challenge is a side mission in Grand Theft Auto: Liberty City Stories. The location of this mission is the Harwood Autocrusher and Junkyard. To start just hop on the Sanchez next to the gray building. Once you start the goal is to get more than 22 point collecting coronas dotted around the track in under two minutes. Green coronas are the easiest to collect as they are only worth one point. Yellow coronas are a little harder to collect and are worth two points. And red coronas are the hardest to collect and are worth 3 points. Once you get more than 22 points the car crusher now gives you 4x the money for vehicles than you would normally get. And collecting more than 31 points which is difficult will give 8x the money for vehicles. This challenge is also required for 100%.
The name of the mission is likely a reference to the British game show Scrapheap Challenge.