According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2000 Chevrolet Blazer has 6 documented known issues, with 4 rated critical. The most serious are ABS False Activation at Low Speed from Wheel Speed Sensor Corrosion ($120-$600 repair), 4.3L V6 Lower Intake Manifold Gasket Coolant Leak ($500-$1,100 repair), 4.3L V6 CPI/CSFI "Spider" Fuel Injector Leaks and Poppet Valve Failure ($500-$1,200 repair) and In-Tank Fuel Pump Premature Failure and Stalling ($450-$900 repair). Across all issues with published estimates, repair costs range from $80 to $1,200. DIY maintenance guides at au7o.io.