Wiring harness damage is the primary long-term risk
Modern vehicles have dozens of wiring harnesses running throughout the body, engine bay, and undercarriage. Heat degrades the insulation on individual wires without severing them. The wire continues to function until it does not. Intermittent electrical faults, sensor failures, and in some cases secondary fires result from heat-degraded wiring that was not replaced during repair.
Hidden Electrical Failures