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Fault code p0420 - catalyst efficiency -- ECU update???
Posted by SJCMarc [Email] (more from SJCMarc) on Mon, 7 Nov 2005 16:16:19
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Hi again,
I posted the note below back in July. I finally took my car to the dealer today for another reason, and had them check this problem too. They would like to upgrade the ECU software because they claim there is a fix for this particular error code in the latest software. They want to charge US$100 to complete the update. Does this make sense -- has anyone else heard of a software glitch causing this error to appear? And does US$100 sound reasonable to apply the fix?
Thank for any input!
Marc
--------- original post -----------
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?
posted by 64.142....
Posts in this Thread:
- Fault code p0420 - catalyst efficiency -- ECU update???, SJCMarc, Mon, 7 Nov 2005 16:16:19 <-- Viewing This Message
- Re: Fault code p0420 - catalyst efficiency -- ECU update???, HammerdStone, Mon, 15 Mar 2010 08:16:16
- Re: Fault code p0420 - catalyst efficiency -- ECU update???, Ann Stalker, Wed, 27 Feb 2008 14:18:57
- Re: Fault code p0420 - catalyst efficiency -- ECU update???, buck, Tue, 8 Nov 2005 07:29:25
- Re: Fault code p0420 - catalyst efficiency -- ECU updat, Steve C, Mon, 7 Nov 2005 20:04:28
- Re: Fault code p0420 - catalyst efficiency -- ECU updat, SWEDECAR
, Mon, 7 Nov 2005 17:39:43 - Re: Fault code p0420 - catalyst efficiency -- ECU update???, 8AA2YM, Mon, 7 Nov 2005 17:13:42
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