Catalytic converters use of valuable precious metals including platinum, palladium, rhodium, and gold has made them a target for theft so thieves can sell these metals for scraps.
The problem is especially common among late-model trucks and SUVs, because of their high ground clearance and easily removed bolt-on catalytic converters. Welded-in converters are also at risk of theft, as they can be easily removed with a reciprocating saw.