Car Problem Reports

Mazda Miata MX-5 Check Engine Light Due to Restricted EGR System

Mazda Miata MX-5 Problem
6 Reports
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Model Years Affected: 1999, 2000, 2010

Average Mileage: 82,150 mi (54,600 mi - 110,000 mi)


The passages for the Exhaust Gas Recirculation (EGR) system can become restricted or clogged causing the Check Engine Light to illuminate. The EGR valve will need to be inspected and the passages cleaned.

  • Visitor, , 110,000 mi

    EGR valve failed & clogged. EGR replaced but problem quickly resurfaced. Turned out that the passageway in the valve cover was clogged, too, and had to be reamed out. That fixed the problem entirely. Runs great now.

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  • Visitor, , 54,600 mi

    Engine light comes on when checked I get code 420 which has something to do with the o2 sensor and the catalac converter, both have been changed and the light still comes on.

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  • Visitor, , 72,000 mi

    EGR is causing the check engine light to come on. This looks like a recall to me I see that I am not the only one with this problem

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  • Visitor, , 92,000 mi

    The check engine light came on and the code read for the EGR system. I replaced egr valve and the light didn't turn off. I had to clean out the throttle body in order to get the light to turn off.

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