To ensure reliability, purchase Ford part # 6S4Z-9F491-A Valve - Exhaust Air Supply Check. It is sometimes referred to as Mercury Diverter Valve, Mercury Secondary Air Injection Check Valve. In terms of quality and longevity, OEM parts are top-tier. This is because they are made according to Ford's demanding factory specifications and go through strict quality control. This part fits specific Mercury Milan models.
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