According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2007 Nissan Armada has 10 documented known issues, with 4 rated critical. The most serious are Timing Chain Guide and Tensioner Wear Causing Cold-Start Front-of-Engine Rattle ($1,800-$3,500 repair), Radiator Internal Transmission Cooler Rupture Mixing Coolant Into ATF ($600-$5,500 repair), Catalytic Converter Substrate Disintegration Clogging the Downstream Converter ($900-$3,500 repair) and Delta Stroke Sensor / ABS Actuator Fault Causing Premature ABS Activation (C1179) ($400-$2,200 repair). Across all issues with published estimates, repair costs range from $50 to $5,500. DIY maintenance guides at au7o.io.