Question about 1993 Saturn SC1
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Posted on Jan 02, 2017
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Jan 02, 2016 | Saturn Cars & Trucks
Oct 10, 2012 | Cars & Trucks
Trouble Code: P0420
Catalyst System Low Efficiency (Bank 1)
Air leaks at the exhaust manifold or in the exhaust pipes Base engine problems (i.e., high engine oil or coolant usage.) Catalytic converter is damaged, contaminated or it has failed. Continuous engine misfire conditions, or weak or low coil output. Front HO2S or rear HO2S is contaminated with fuel or moisture. Rear HO2S is loose in the mounting hole (check it for a leak). Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy) .Here is what is listed in the Saturn repair guide.
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