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	 2016 Ford F-350 Super Duty XL 6.2L MIL Lamp on 
		
		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 ... 
                        
                            FIX posted 4/6/2023
                             
                 
                            
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| VIN | 1FT8W3B69G | 
| Engine | 6.2 L / 8 cyl / FLEX | 
| Trans | 6-speed Automatic (Electronic) | 
| Delivery | Fuel Injection | 
| Emissions | OBD-II Compliant | 
| Symptoms | MIL Lamp On | 
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) | 
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 Vehicle Data
                2016 Ford F-350 Super Duty XL
| VIN | 1FT8W3B69G | 
| Engine | 6.2 L / 8 cyl / FLEX | 
| Trans | 6-speed Automatic (Electronic) | 
| Delivery | Fuel Injection | 
| Emissions | OBD-II Compliant | 
| Symptoms | MIL Lamp On | 
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) | 
                            
14 Replies Received
          14 Replies Received
          
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