Question about 2005 Chevrolet Silverado 1500 2WD

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Codes 0101 0171 0174 0446

I am concerned because I got all four of these codes at once. It still runs good but not sure what I need to fix

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I would recommend clearing the codes first and finding out if all four come back again.
Code 101 is for a problem with the mass air flow sensor circuit. The sensor measures the amount of air entering the intake.
Code 171 and 174 are for the O2 sensors telling the computer the fuel system is too lean on both banks.
Code 446 is for a problem with the EVAP system which is what the computer uses to vent the gas tank to the vapor canister.
Its possible code 101 could cause the next two, but not the last one.
If the codes come back after you drive the truck, each code would need to be investigated.

Posted on Apr 27, 2013

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