Why did 1998 ML320 fail emissions test twice?

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On 8-21-10 my SUV failed the first emissions test. It gave codes P0100 Mass Air Flow Circuit Malf and P0400 Exhaust Gas Recirculation Flow Malf. On 9-13-10 Cleaned EGR valve and ports. On 9-24-10 replaced Mass Air Flow Sensor. 9-24-10 check engine light came back on, code P0400 EGR showed up again.

Ms. Rita in Lawrenceville GA

Oct 4, 2010

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What are the best Mercedes-Benz repair shops?

RepairPal Certified shops can diagnose and repair your 1998 Mercedes-Benz ML320. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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Closed

Opens 8:00 AM Fri

Call