audi A4 quattro

2003 AUDI QUATTRO
89,321 MILES • V8 • AWD • AUTOMATIC
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NATHANIEL MALAST
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I have a 2003 audi quattro, is running great, I changed the oil and filter, car is still running great as ever then check engine light came on even though no apparent problems, took it to be read they said catalytic converter? could this be, thanks, Nathan
Aug 5, 2011 at 10:28 PM
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RASMATAZ
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Go to this link: https://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
Aug 5, 2011 at 10:33 PM
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NATHANIEL MALAST
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srry, forgot to add this. Code was read as P0420?
Aug 5, 2011 at 10:46 PM
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RASMATAZ
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Have the catalytic converter checked-
Aug 5, 2011 at 10:47 PM
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NATHANIEL MALAST
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could this be normal, the car is running great?
Aug 5, 2011 at 10:50 PM
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RASMATAZ
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•P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
Aug 5, 2011 at 10:54 PM
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