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P0400 and C1201 are diagnostic trouble codes that are often misunderstood. P0400 is a powertrain code indicating an exhaust gas recirculation (EGR) flow malfunction; it is not a suspension or strut code. C1201 is a Toyota manufacturer-specific chassis code, typically associated with the ABS/VSC traction control system, not with the struts themselves. For a 2002–2003 Toyota Camry, the front suspension uses MacPherson struts and the rear uses an independent dual-link MacPherson strut design. When replacing worn struts, complete strut assemblies are recommended because they include the strut, coil spring, upper mount, boot, and bump stop in one pre-assembled unit. This simplifies installation and avoids the need for a spring compressor. Replace struts in pairs, either both front or both rear, and check the vehicle trim, drive type, and VIN before ordering because part numbers differ between front and rear, and also between models with or without ABS/VSC. After installing new struts, a wheel alignment is strongly recommended to prevent uneven tire wear and maintain proper steering response.