2003 Pontiac Vibe Catalytic Converter

2003 PONTIAC VIBE
114,000 MILES • 4 CYL • FWD • MANUAL
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PONTIACVIBE2003
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I had my cats changed last year, but my check light is back on for a PO420 cat efficiency low bank 1. The mechanic says I need a heavier cat, but the muffler guy says the cats may not be the problem. What do you think?
Aug 18, 2009 at 12:04 PM
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WINEBURGER
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the platinum group metals burn up excess fuel in the catalytic coverter. scrap large gm converters are worth $75 aftermarket converters are worth $5 aftemakets have alot less platinum in them.the o2 sensor takes a readind before and after from two diffrent sensors the diffrence between those two are the efficiency. so faulty o2 sensors is less likely than a aftermarket converter
Aug 18, 2009 at 12:32 PM