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    Service Done Right #6: Troubleshooting The P03xx Misfire DTCs

    Jan. 22, 2022
    The P0300 series of DTCs covers misfires and ignition system-related faults. Maybe that’s why replacing spark plugs and coils is the most popular response to them. But there’s more to curing misfires than swapping plugs.
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    It’s fundamental. The engine needs three things to run: spark, fuel, and compression. These three must occur at the right time and in the right amount or a misfire will result. Some misfires will be severe, others minor - all will result in lowered performance and overheating of the catalytic converter.

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