P0420 Diagnostic Trouble Code Discussion for September 2021
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2015 Ford F-550 Super Duty XL 6.8L Surge VIN: 1FDUF4GY5F P0420: Catalyst System Efficiency Below Threshold Bank 1. This is a long story. The customer claims the problem came after the truck lost power and shut off due to a plugged cat. Another shop replaced the cat with a small after market one. It now has a surge under acceleration. The other shop replaced the fuel pu... |
September 17, 2021 |
