According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2006 Hyundai Elantra has 12 documented known issues, with 3 rated critical. The most serious are ABS Module Short Circuit Causing Engine Compartment Fire (Recall 20V061), Timing Belt Neglect Leading to Bent Valves and No-Start ($700-$2,500 repair) and Front Coil Spring Fracture and Tire Damage ($500-$1,200 repair). Across all issues with published estimates, repair costs range from $50 to $2,500. DIY maintenance guides at au7o.io.