Question about 1998 Chevrolet Cavalier
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Posted on Jan 02, 2017
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Catalyst System Low Efficiency
Air leaks at the exhaust manifold or in the exhaust pipesBase engine problems (i.e., high engine oil or coolant usage)Catalytic converter is damaged, contaminated or has failedContinuous engine misfire conditions, or weak or low coil outputFront HO2S or rear HO2S is contaminated with fuel or moistureRear HO2S is loose in the mounting hole (check it for a leak)Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy)
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