Small cracks can often be sealed, but a slab that has sunk or heaved usually needs to come out.
Repair or Replace
Hairline cracks are common and often harmless. Sealing them keeps water out. Wide cracks, broken corners and panels that sit higher or lower than the next one are signs of movement under the slab. Patching those rarely lasts.
If only one or two panels are bad, a contractor can cut them out at the joints and pour new ones. If the whole slab is broken up, a full replacement is often the better value.
Find the Cause
Concrete moves when the ground under it moves. In this part of the County, Expansive clay soaks up water and swells, then shrinks as it dries out. is a common reason. Water from a downspout, a leak or a sprinkler can make it worse. Fix the water first, or the new slab may crack the same way.
Matching Old and New
New concrete rarely matches old concrete in color right away. It may blend in over time. If the look matters, ask about replacing a whole section from joint to joint, or adding color.
Repairs at the Street
A broken driveway apron or sidewalk panel may sit in the public area. Work there can need an encroachment permit. Chula Vista lists that form on its forms page. Check with the city first.