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Engine Control System - DTC Diagnostics (3 Of 6)
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Troubleshooting
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DTC Troubleshooting: P0420(3.0L Engine)
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Overview
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DTC Troubleshooting: P0420(3.0L Engine): Overview
If the ratio of the A/F sensor (Sensor 1) sum and the secondary HO2S (Sensor 2) sum is higher than a specified value, the PCM determines an abnormality and stores the DTC.