DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
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: |
|
||
| 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 . | ||