2013 XLT (3.5L) - P0303 Code

[Rog13]

Had a P0303 Code come up and did the following. Replaced Coils, Plugs and Fuel Injectors. After change out, received Code for Bank 2 Converter Temp Issue. With some searching, sounded like Downstream O2 Sensor. Replaced Downstream O2 Sensor. Afterwards, P0303 came back and seems worse than before. Anyone have any ideas, could it be the Bank 2 Converter is shot.

 

[peterk9]

Several exiting threads show a P0303 error but also have additional codes.
Here is one where the fix was an injector replacement but is seems you've already done that. 2013 explorer 3.5 rough idle p219a and p0303

Peter

 

[Rog13]

Several exiting threads show a P0303 error but also have additional codes.
Here is one where the fix was an injector replacement but is seems you've already done that. 2013 explorer 3.5 rough idle p219a and p0303

Peter

Thanks Peter for this information. Correct, Injector was also replaced. Problem does not seem to be there when engine is at full running temp. Just when the engine is cold, slowly runs better as it gets to full temp.

 

[Rog13]

Had a P0303 Code come up and did the following. Replaced Coils, Plugs and Fuel Injectors. After change out, received Code for Bank 2 Converter Temp Issue. With some searching, sounded like Downstream O2 Sensor. Replaced Downstream O2 Sensor. Afterwards, P0303 came back and seems worse than before. Anyone have any ideas, could it be the Bank 2 Converter is shot.

Follow up: After moving Coil and Plug from #3 to #6, received P0306. Replaced #6 Plug with another new Plug and Code came back (P0306), replaced the New Coil with previously used Coil and Code is gone. Seems that the New Coil was defective. P0430 code, also has not come back. Maybe this will help someone else. I guess, even if the part is new, does not mean that it is working correctly.

 

[peterk9]

Thank you for posting the update.

Peter