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Control arms and ball joints are essential to suspension geometry. When a control arm bushing, ball joint, or mounting point wears out, the wheel hub can move during braking, acceleration, or cornering. This movement may disturb wheel-speed sensor signals and can set chassis diagnostic trouble codes such as C0036 and C0040. In many OEM applications, C0036 refers to the left front wheel speed sensor circuit range/performance, while C0040 refers to the right front wheel speed sensor circuit. Because these codes are sensor-circuit codes, they do not directly identify a bad control arm. A thorough diagnosis should include checking the sensor connector, harness, tone wheel, hub bearing, and any excessive play in the control arm or ball joint. For replacement parts, MRC 4708289 is a control arm assembly part number used in some vehicle applications; verify fitment by VIN and original-equipment part number before installing. For component validation, SAE J1695 is often referenced when evaluating suspension control-arm fatigue and structural integrity. A combined service approach -- inspect mechanically, verify with OEM DTC procedures, and use fitment-confirmed parts -- reduces comebacks and improves safety.