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Rear suspension clunks or rattles on the Lexus IS250 and IS350 are often traceable to worn upper strut mounts, damaged lower shock bushings, or fatigued multi-link arms. A failed strut mount can allow the damper rod to shift, producing a metallic knock over sharp bumps. Wheel-speed sensor wiring can also be chafed by a loose spring seat or bracket, setting chassis-control codes such as C0210 (rear speed sensor, right) and C0215 (rear speed sensor, left). Related ABS/VDIM codes like C1222 or C1241 may appear if the control module sees an inconsistent wheel-speed signal or low system voltage; these codes should not be treated as isolated electrical faults without inspecting the surrounding suspension hardware. For 2026, aftermarket strut assemblies are expected to meet more demanding validation under documents aligned with IATF 16949:2016 and with fatigue-test profiles similar to SAE J1202, covering rebound, compression, lateral loading, and salt-spray exposure. When replacing rear struts on the IS250/IS350, choose units with full top-mount and bumper-stop kits, verify torque for the upper mount and lower knuckle bolts, and perform a four-wheel alignment. Documenting before-and-after noise tests and clearing stored DTCs after repair helps confirm that the suspension fix addressed the root cause rather than masking an unrelated sensor fault.