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Would a bad gas tank fuel pump o ring leaking would it throw a 401 code
1999 Buick Regal

Would a bad gas tank fuel pump o ring leaking would it throw a 401 code

(1999 Buick Regal)
replaced egr, evap valve charcoal canister, vent valve, gas tank fuel pump o ring replace and seal. before that i was getting a 401 and 440 code and engine light on, after fixing the fuel pump leak i am now only getting a 401 code, so what else can i do.
Tags: buick, regal
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Popular Answer
on April 29, 2018
Clean the carbon from the EGR passages,check all vacuum lines for splits,cracks,dry rotted. you fixed the EVAP problem,so now you have insufficient egr flow.
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General Diagnosis
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on April 29, 2018
Clean the carbon from the EGR passages,check all vacuum lines for splits,cracks,dry rotted. you fixed the EVAP problem,so now you have insufficient egr flow.
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