If the cat was bad... - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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If the cat was bad...
Posted by bazil burns [Email] (more from bazil burns) on Tue, 8 Aug 2006 17:35:03
In Reply to: So CEL for O2 sensor #1 probably isn't the cat?..., AlexA, Mon, 7 Aug 2006 15:43:55
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well, if it were plugged, you'd have no power to speak of. if the ECU, using the two o2 sensors, determined that the cat was not properly reducing emissions, you'd have a p0420/422 (sorry, spending too much time around hyundais, don't remember which), definition of which is something like "catalyst efficiency below threshold".
If you had a bad o2 sensor, a code would appear relating to that o2 sensor. I have a stage 3 JSP ECU and the sport exhaust, and a teeny leak at the joint right after the cat/before the flex pipe. I get some VERY loud backfires now and then, accompanied by a flash of flame out the back. :-D
--bazil
'99 9-3
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