Car bombs in GTA IV are first encountered in the Gerald McReary mission Actions Speak Louder than Words where they are used to destroy a fuel depot.
Car bombs in GTA IV can later be obtained through Patrick McReary as a friend special option. They will be delivered to the player's general location and the player can place the bombs beneath cars, buses and light vans only. The bombs are remote detonated through calling Packie on the cell phone and selecting Detonate.
GTA Chinatown Wars
Not to be confused with Proximity Mines, which also affect vehicles with explosions, car bombs, which are introduced in the mission Operation Northwood, can be fitted at a garage in North Holland. Upon entry, the touch screen will show a picture of the car's engine, which you then must place the bomb onto and wire it up. The bombs cost $500, as in previous iterations. Once placed in the car, the detonator symbol will appear in the PDA. This can be activated at any time, both in-vehicle and out, and will instantly destroy the car and any others or pedestrians surrounding it.