Fault code p0420 - catalyst efficiency below thld. - Saab 9-5 Bulletin Board - Saabnet.com
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Fault code p0420 - catalyst efficiency below thld.
Posted by SJCMarc [Email] (more from SJCMarc) on Tue, 19 Jul 2005 21:42:36
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Hi,
I have a 2001 9-5 SE wagon, about 60k miles. The check engine light has been coming on and going off periodically over the past few months. I went to AutoZone and read the code today, and it was p0420 - catalyst efficiency below threshhold. I'm going to take the car to the dealer and have them diagnose the actual problem, but I figured I should get educated first :-) Does it sound correct that this code means a bad catalytic converter or bad oxygen sensor(s)? If my fuel efficiency has been normal, would the converter itself more likely be the issue? Finally, I think the converter would be covered under the U.S. federally mandated emmissions warranty. How about the oxygen sensors?
Thanks for any insights!
Marc
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