According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2012 Land Rover Defender has 6 documented known issues, with 3 rated critical. The most serious are 2.2 TDCi (EU5) Oil Pump Disintegration / Oil Starvation ($1,500-$6,000 repair), MT82 Gearbox Rear Output-Shaft Spline Fretting (Loss of Drive) ($600-$2,500 repair) and Rear Crossmember & Chassis Rot (Salt-Belt Corrosion) ($350-$5,000 repair). Across all issues with published estimates, repair costs range from $120 to $6,000. DIY maintenance guides at au7o.io.