Car Problem Reports

Mazda Miata MX-5 Check Engine Light Due to Improperly Manufactured Threads on Fuel Filler Pipe

Mazda Miata MX-5 Problem
19 Reports
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Model Years Affected: 1999, 2006, 2007, 2008, 2009, 2010, 2012

Average Mileage: 34,562 mi (8,444 mi - 145,000 mi)


Some models may have a problem where the Check Engine light illuminates indicating an improperly tightened fuel cap. Due to improperly manufactured threads on the fuel filler pipe, the filler pipe may need to be replaced.

  • Visitor, , 29,605 mi

    check engine light comes on. Dealer Service shows problems with fuel filler pipe but this vin# not included in recall. Why?

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  • Visitor, , 38,000 mi

    Starting when I bought this car used with 37000 miles on it I get a check engine light the code set is a loose gas cap and has now occurred 3 times in the last 9000 miles. I know that the cap has been reinstalled properly after refueling and I have to bring the car to my mechanic to reset the engine light, the cap is loose when the light comes on.

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  • Visitor, , 16,500 mi

    CEL comes on
    Gas cap comes loose

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  • Visitor, , 9,550 mi

    got code p0442 and replaced fuel cap with new redesigned mazda one. light stayed off for 100 mile and came on again. cap was loose. dealer will not fix.

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  • Visitor, , 16,000 mi

    Check engine light came on. The code read by the service center pointed to the fuel filler cap. It was replaced and the problem went away.

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  • Visitor, , 21,941 mi

    engine light comes on and stays on, the fuel filler cap is loose, I tighten it and in a few days it comes loose again all on its own.

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  • Visitor, , 61,500 mi

    Check engine light on

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  • Visitor, , 24,030 mi

    Repeated check engine lights after fueling vehicle and tighening gas cap.

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  • Visitor, , 8,444 mi

    Taken the car in to the dealership 3xs. They continue to maintain that the light is on because I am not "tightening the gas cap enough"! I KNOW how to tighten a gas cap!! Today I was humiliated while the service consultant explained that "if" I am telling them the truth, they will do me a "favor" by replacing the gas cap, because it is clearly the owner's mistake and not theirs! Grrrrrr

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  • Visitor, , 145,000 mi

    I have not fixed the problem, but every time I fill up the gas tank, the check engine light comes on. Once the fuel level drops below 1/4 tank it goes away.

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