P0420 Diagnostic Trouble Code Discussion for March 2023
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2016 Ford F-350 Super Duty XL 6.2L MIL Lamp on VIN: 1FT8W3B69G P0420: Catalyst system efficiency below threshold Bank 1. This Ford came in with catalyst efficiency codes for both banks. I replaced converters with Ford y-pipe and cleared codes. It came back a few days later with same codes. No other codes. Any ideas what could cause this. Usually new converters takes care of ... |
March 14, 2023 |
