Converter Codes: How Long Will the Light Stay Out?
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Converter Codes: How Long Will the Light Stay Out?

Any time you’re troubleshooting an OBDII problem, use a scan tool that can tell you if all the monitor readiness flags have been set. If one or more monitors are not ready, the vehicle will have to be driven under varying speeds and loads until all the monitors are set. Then, and only then, will you get an accurate diagnosis from OBDII.

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catalytic-converter-codeOBDII systems with faulty catalytic converters will normally store a diagnostic trouble code (DTC) when the converter begins to fail. The OBDII converters use an upstream and downstream oxygen sensor to measure the differences in oxygen content between the inlet and outlet gases. In virtually every case, the OBDII system will detect a converter failure long before it can be detected using shop equipment.

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Consequently, before replacing an OBDII converter, always check the diagnostic memory for converter-related DTCs, such as a P0420.

For Andrew Markel’s complete article from Brake & Front End, click here.

 

 

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