This may be due to various software parameters within the PCM. To correct the condition, reprogram the PCM with the latest software and replace the catalytic converter.
Some 2019-2020 Ford Ranger vehicles may exhibit a MIL on with DTC P0420 (catalyst system efficiency) stored in the PCM.
This may be due to various software parameters within the PCM. To correct the condition, reprogram the PCM with the latest software and replace the catalytic converter. Also inspect condition of the O2 sensor and replace if needed.
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