Question about 2000 Mazda MX-5 Miata

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Engine light on, mazda mx5, 1999

I replaced the 1st O2 sensor, the light went off for a whilw, but it came back

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  • maccabej May 21, 2009

    Apparently there are three ways to get rid of a check engine light.
    One is remove the three fuses called BN 20a fuses under the hood on the right hand side near the firewall. This will get rid of a lignt intermittent when either the gas cap is not on tight enough. It could also come on if the crossover in the intake manifold is clogged. Expensive repair. The nextt option is to check the Mass Air Flow sensor and the TPS switch. Check range of voltage output from each. Easy test. The others could be EGR valve or either of the TWO O2 sensors. They both should swing through different voltages cold and hot. These are tests done with a meter that reads from under the dash. O2's are very expensive. Usually the rear is the culprit. Hope this helps.

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Clean the egr valve out with carb cleaner will work for a while but cant promise how long

Posted on Feb 21, 2009

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1 Answer

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