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Replaced everything associated with 171, 174 codes and still get service engine soon light.
Vehicle: 03 F150 2wd 4.2 V6

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When everything has been tried and a fuel trim lean is just too elusive, try this use a fuel injector cleaner adding into the fuel tank is also a good concepts, Usually a top end cleaning is what is commonly used, we where able to restore the fuel trim doing this

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