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Home >> Kia >> 2000 >> Spectra GS, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - SEPHIA & Spectra >> Diagnostic Trouble Codes >> DTC P0139: Rear Heated Oxygen Sensor (Ho2S) Circuit Slow Response >> Diagnostic Aids

Diagnostic Aids

Check for following possible problems:

Front and rear HO2S connections reversed.
Fuel delivery system malfunction.
Leak in intake system.
Leak in exhaust system.
Rear HO2S malfunction.

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