How to address P0430 P0420 and high fuel

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4 months 1 day ago #203143 by sh_ksa
Hello everyone,

I'm hoping for your input and opinion about this

CAR: Explorer 2013 V6 standard

Symptoms:
P0430 P0420 which is the catalytic converters are below efficiency threshold. Both sensors readings are about 0.74 constant when car is idling at full stop.
Higher than average fuel consumption for my driving conditions and style. Getting 15-16 mpg.
Car rarely feels like about to stall when come to a stop and it did a couple of times.
Other than that, the car is normal and there is no misfire in the engine

Things I did to help with the fuel consumption:
Used a fuel system cleaner from bg.
Changed engine air filter.
Changed spark plugs.

Form what I gathered searching and looking for possible causes are 2 possible issues for the codes and the higher than average fuel consumption:
1. A vacuum leak.
2. Fuel system pressure.

My questions are:
1. Will a vacuum leak trigger the CEL and specific code or not in my car?
If yes, it means that I don't have a vacuum leak and I should look somewhere else.
If no, is it possible that the vacuum leak could trigger P0430 and P0420 codes.

2. Let's assume I have a problem in the fuel system, higher or lower than normal pressure. Will that always trigger a code?


P.S: Watching YouTube videos and reading articles online trying to diagnose a car issue could make you go banana sometimes.



thanks

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4 months 1 day ago #203149 by dtidman
Replied by dtidman on topic How to address P0430 P0420 and high fuel
What are your short and long term fuel trims?

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4 months 1 day ago - 4 months 1 day ago #203154 by sh_ksa
Replied by sh_ksa on topic How to address P0430 P0420 and high fuel
here is the values:
SHRTFT1=1.6
LONGFT1=3.9
SHRTFT2=2.3
LONGFT2=3.1

a follow up:
the downstream O2 sensores are not constantly reading 0.75 at idel. it read 0.85 after just starting the car after a long park. it's readings also jumping to very small values when revving the engine.
Last edit: 4 months 1 day ago by sh_ksa.

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4 months 13 hours ago #203160 by relative4
Replied by relative4 on topic How to address P0430 P0420 and high fuel
Probably bad cats. An infrared thermometer will help verify.

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4 months 11 hours ago #203165 by sh_ksa
Replied by sh_ksa on topic How to address P0430 P0420 and high fuel
dose the fuel trim readings eliminate and possiblity for vacuum leak or fuel system issues?

should I look for exhaust leaks?

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4 months 7 hours ago #203169 by relative4
Replied by relative4 on topic How to address P0430 P0420 and high fuel
Pretty much.

Sure.
The following user(s) said Thank You: sh_ksa

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