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KIA SPECTRA 4 CYLINDER ,I HAVE THE CODES P0449,P1166,P0171,P0300,P0301,P0302,P0303,P0304,P0506 ,wHAT IS THE ROOT PROBLEM?

Vehicle: 2002 KIA SPECTRA 4 CYLENDER

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P0449 Evaporative emission control vent valve solenoid circit malfunction

P1166 02sensor lamba controller at limit

P0171 Fuel trim lean Bank 1

P0301 Misfire number 1 cylinder

P0302 Misfire number 2 cylinder

P0303 Misfire number 3 cylinder

P0304 Misfire number 4 cylinder

P0506 Idle control system RPM lower than expected

Two main issues, If there is a misfire condition the 02 see this as a lean condition due to the incomplete combustion, If the RPM is low you get a misfire code.Clear the code, If P0506 set, clean the throttle body,

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