Fit For Mazda CX3 EGR Valve S550-203C0 S550203C0. OEM NO. : S550-203C0. Wide compatibility: Suitable for models of multiple brands, please check the applicability of specific models before purchase to avoid incorrect installation. Replacing the valve restores the emission system to normal, avoiding the problem of being unable to drive due to non-compliance with environmental regulations. Reduces engine vibration and stalling risk. After replacement, the idle speed is stable, cold starts are smooth, and driving safety is improved., Manufacturer: ATEHDEN