P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
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DTC DESCRIPTION P0420 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)
| Description: During a regeneration, the PCM expects the temperature across the OC to increase by a calibrated amount. This DTC sets when the increase in temperature is less than 40% of the expected maximum increase. | |||
Possible Causes:
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| Diagnostic Aids: Verify there are no concerns present with the fuel system and EGT sensors. Monitor the EGT11 and EGT12 PIDs to determine the temperature change across the OC. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST RA . | ||