According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 Toyota Tacoma has 14 documented known issues, with 2 rated critical. The most serious are Brake Master Cylinder Internal Seal Failure Causing Soft Pedal and Reduced Braking ($450-$1,100 repair) and Secondary Air Injection Pump and Switching Valve Failure on 4.0L V6 ($1,200-$3,000 repair). Across all issues with published estimates, repair costs range from $20 to $3,000. DIY maintenance guides at au7o.io.