Common issues with the 2013 Toyota Reiz 2.5S in the used car market include: 1) Engine oil consumption, often caused by aged valve seals or worn piston rings—resolution involves replacing these components. 2) Valve cover oil leaks due to deteriorated gaskets, which can be fixed by replacing the seals. 3) Suspension shock absorber leakage, requiring shock absorber replacement. 4) Persistent interior odors from poor-quality front bulkhead insulation pads and floor mats, which may need thorough cleaning or replacement. 5) Trunk water leaks, typically due to aged weatherstripping, deformed trunks, or clogged drain holes—solutions include replacing weatherstripping, repairing deformation, or clearing drain holes.