catalyst system efficiency below threshold bank 1 VW Passat

Asked by Aug 19, 2015 at 10:23 AM about the 2005 Volkswagen Passat GLS 4Motion

Question type: Maintenance & Repair

My question is that my engine light would always come on and stay on stating Catalyst system efficiency below threshold bank 1. I was told by the VW dealership i need a new catalytic converter. I put it on now the check engine light randomly will come on and off instead of it always being on before for the same error code. Any ideas would be great thanks. 2005 VW Passat GLS 4 Motion 1.8T 160,000KM (100,000MILES)

1 Answer

93,145

Try Mr. Gasket 120007 converter cleaner, sometimes it works sometimes it don't, just depends on what is contaminating the converter.

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